If I've set things up right, the title of this video should say "gas" for US people, and "petrol" for UK people! If you're in one of those countries, can you confirm? The sponsor is 80,000 Hours: head to 80000hours.org/steve to start planning a career that is meaningful, fulfilling, and helps solve one of the world’s most pressing problems.
Geo Metros, not so much. And, it should go without saying that the safety of driving a smart makes a Metro seem terrifying in comparison. There is no reasonable comparison between the two.
@Goriller No, not really. A smart gets about 35 in city driving, low 40s on the highway. Those numbers are pretty easy to beat. But, buying a smart for gas mileage alone would be a mistake. The mileage isn't terrible, but it's not the king of gas mileage either. They're a kick to drive though.
@Goriller Hmmm, my smart's tank holds 8 gallons, and that's good for 300 miles. I even pay extra for premium fuel, sometimes for ethanol free fuel for an extra kick, without taking out a loan. Plus, I get a roof over my head in rainy weather and air conditioning in hot weather. I consider it my four wheel motorcycle, with benefits. And, it's a kick to drive with its paddle shifters and Porche worthy handling. Taking it into the mountain twisties and I can outrun all but the sports bikes, who are dragging their feet to keep up.
I’m a an engineer and I used to work for the company that originally created that design. Actually, I redesigned that ball bearing mechanism. I can confirm that you are correct in your assessment of how it works. Also, most gas nozzles have a second diaphragm or plunger (not membrane) that deflects when there is pressure in the fuel line. It is used for prepay fill up. When you hit the prepay amount the dispenser shuts off, the pressure in the nozzle drops and that second diaphragm which is spring biased up will move and shut the nozzle off. There is a third shutoff in some nozzles that is called an attitude device. When a … moron… pulls a flowing nozzle out of a car’s fill pipe, a ball bearing blocks the pickup tube and shuts the nozzle off.
Please make a video about that too :P It's quite difficult to understand how prepay is hit and what happens when a moron pulls out a flowing nozzle out of the car.
Excellent explanation. It was worth the effort you put into that illustration. Thanks to that I have understood perfectly how something that I always ask myself works. You have made all of that seem so easy now, and it really is, but to most of us it seems more complex than reality. Thanks and greetings from Tampa, Florida.
Its very simple mechanically if you think of the two parts as a sensor and a signal not to mention whatever it takes to close the valve. These gas pumps basically take a three part problem and use two mechanisms to solve all three. The beauty of the design is that both operate with only fluid dynamics. Most other sensors require a bit of chemistry or some other physical property (to detect a chemical presence) and a bit of electricity (to transmit the signal) as well as moving parts to operate the valve.
Many youtubers wouldn't have taken the time to craft the supplementary models that you made for this explanation, but I am SO GLAD you did. I'm a big visual learner and those models were excellent (and I can tell you had fun making them as well).Thanks for answering yet another question I didn't know I had!
As a (retired) technology teacher, I can respect the huge investment in time and energy needed to make and test those models. Also your perspex models are getting better as you learn. Good jobs all round.
@ALakes Show us your data demonstrating that "teachers have to announce they are a teacher everywhere they go". How would you know all the times that teachers did not announce their professions? Sad (apparently).
@Donald Sayers I never said I had a poor opinion of the profession. I find it funny yet sad that teachers have to announce they are a teacher everywhere they go. It's a simple observation.
@ALakes Given that what I did was exactly making perspex models to demonstrate things, I thought it relevant. I'm sorry you have such a poor opinion of the profession, but being retired I can now forcefully suggest where you can stick your opinion. Ooh dark sarcasm...
As a sales engineer I find it amazing how you drive us through the explanation and build up the complexity of it. I'm learning more than just how gas pumps work!
Your vids help me learn physics in a way my college classes couldn't. Even though this was a lot to follow and kind of hard, it all clicked in the end and I feel so excited to know how this system works 😊
This is such a clever combination of principles but the most impressive thing for me is the way it was explained. This is the best step by step breakdown of any educational topic I’ve ever seen. Not one of the best, the best! Every time a side issue that could have scuppered things arose it was dealt with before it could be a factor that might throw you off course. Congratulations on this level of understanding of not only the things you are explaining but also the human learning experience. Top class!
This is one invention that never seems to fail. It's never failed for me and I'm 66 years old. I've never seen or heard of this valve not working from other people either. That's quite a successful bit of engineering, I'd say.
I've had one fail once on me about 12 years ago and I saw it fail one other time for someone else just a couple of months ago. Both times gas went everywhere. I always stay and wait for it to stop.
unfortunately they do fail it is just that gas stations have maintenance that goes on. I try to get there really quickly everyday of the week, rain or shine. when a service call comes in and I switch out the nozzles all the time due to failure of the valves and leaks that occur within them.
Great video. What I like about this mechanism is how non-electric this is. You have to admire engineers that developed that back in the days. Nowadays I got impression everything needs to be computer controlled. This mechanism shows us what true engineering is and it is uncanny.
My parents ran a gas station and I helped them since I was a child. Your explaination helped me understand a phenomenon I experienced many times in my first twenty years of life! Very ingenious, hope someone was rewarded for this mechanism. Nice video and very good explaination, thanks!
Amazing how the small differences in pressure are utilized to trip simple mechanisms and close off the primary valve when your tank is full. Awesome, thanks so much for this!
Thanks for explaining something that I briefly wonder about when filling up, and then forget about when I drive off. Now I will always know what happens!
You can feel the petrol (water) hammer/hydraulic shock when the pump shuts off as the valve closes as well. Always wondered about that, cheers Steve this was really interesting
It's an amazing device. You would think there are a bunch electronic stuff to make it work, but all it require is the understanding of physic and some very clever engineering and design.
I always assumed that was just the force of the valve "slamming" shut in order to avoid leaks/price discrepancies. I suppose that is still technically correct (the best kind of correct) but more-so as a happy accident. Good to know that it was actually a safety valve. As I've said time and again when someone (usually a boss) complains about fire safety. "Fire safety is paid for in blood." Meaning we don't get these rules and functions without a lot of deaths first.
@Agustin Campeny The constriction at the base of the hose, as Steve pointed out at 3:37. It's spring loaded so it's normally closed if there's no pressure from the flow. If you meant the handle, it just the springs at both column that also normally close and will put the handle lever down if you not holding it (or prep it with the tiny metal piece on the handle).
Excellent technical explanation.The time and effort you put in resulted in a very clear and understandable process of how a fuel shutoff mechanism works. Terrific job!
I've wondered about how gas pump nozzles work for most of my life but never bothered to look into it. Great video and easy to understand. Thanks for putting this together.
This is an excellent explanation. I knew that the valve was controlled by a venturi-generated pressure differential, but never took the time to understand the actual mechanics of the fluid passage and the shutoff trigger. Really well explained here.
I wouldn't be surprised if there are electronic components to some these days or in the near future. But these automatic shutoffs long predate the cheap and widely available integrated circuits we have today to enable us to computerize everything. These cutoffs were used before electronic displays became common. /I had always assumed it was based on a float, though
Many principles that would function forever with repair that a craftsman can do will be replaced by digital stuff that needs from now on monetarized upgrades from above. That's cool for the big players.
Great video with very good illustrations and descriptions. I always had some idea of how I thought it worked (I assumed some sort of cam and/or clutch mechanism paired with some kind of air pressure sensitive system) and it was nice to finally understand. Thank you for the explanation.
Fascinating video! I love the way you explain this, and the mock ups you used. Really nice work! Thank you for sharing this. I've always wondered how they work.
that mightve been one of the most interesting youtube videos i've ever seen and believe me i've watched a lot. spectacular job at coming up with the models to explain the mechanisms. thank you!
Holy cow, that was an amazing video explaining all the different pressure effects and illustrating it with amazing models. I always love your channel, but I just wanted to say this one was pretty cool!! Great job on the effort!
I remember looking up how this worked a few years back. The fluid dynamics and drawings went way over my head and I was left confused. Incredibly impressed (but not surprised) that you managed to clearly explain the mechanism to a total lay person in just over ten minutes!
@Micah Philson waste of time, people that see ghost where there aren't, better the invent something on your own and hope that it sells. they asked me as well when i was 18 and i told them you must be joking, you must be out of your mind and they left me alone, recently i got to speak to one of these people, lol.
@Analog Dude I'm in a military training program, we're only learning about the systems and the theory behind the systems we use, and working practically with those systems. We're taught by people with like at least 6+ years of experience, not professors. But to do it, we have to learn all the theory and physics, chemistry, materials science, fluid dynamics, engineering etc. behind it all because it's literally nuclear physics and nuclear power.
@Micah Philson because "highly" educated people think to complex, i follow a professor here on tube, it's pretty much theory, but no practical experience and rather clumpy. they have a star mind, not really open for new things and ideas, than someone without a university degree comes along and leaves the professor stunned and in the dust. you shouldn't really admire these people, they aren't really smart al better at numbers because of routine. they can't solve simple things.
I've been going through an engineering course over the last couple years, and I've learned a ton about fluid physics and dynamics. This video covered so much of those classes all at once and explained it all so clearly and succinctly, such in-depth topics so concisely, he makes it look easy! This video is incredibly well done!
This is the most intuitive and thoughtful explanation I have ever seen. I knew about this Venturi affect in fuel pump model but I never understood it completely as there was always some element of doubt on my mind until I saw your video. This is so satisfying now for me. Tremendous effort in putting this video. A ton of thanks.
I was mentored by the two engineers who patented this back in 1965 and worked with them for over three years. They are both gone now, but they gave me a lot of knowledge during that time. One was like a second father to me and he was as detailed and meticulous as one could be. They two men didn't get much out it as like most corporations do, the board takes it all for themselves.
If they worked for a company when they invented it then yeah, obviously the company they work for would OWN the invention. If you truly want to make a lot of money from something you invented you have to do it yourself and then sell it to a corporation/company. Not sure why you seem to imply they should have gotten more from their invention. When you work for a company they pay you and give you the resources needed to create and invent the thing you've been tasked to create. Usually you sign something when you work somewhere that anything you invent as a result of your employment is owned by the company. It's not as if the board swoops in and is like SURPRISE! THIS IS OURS NOW!!! MWAHAHA!
@Karl Schneider Why is it sad? You voluntarily agreed to work for a company. You signed a contract out of free will to receive money in exchange for work. You did the work as agreed and then you were paid as agreed. I don't see anything wrong.
Always wondered how these worked. It's an astonishingly reliable mechanism. Having worked in a fuel station I have seen them fail to stop on occasion. mostly in the winter months.
I do love a well designed mechanical solution. thanks for taking the time to explain this. I thought it was something related to pressure and valves, but never imagined the system was this complex.
Oh man. I found this channel a while ago and it just feels like a science show I always watched as a kid, but like...for adults. Thanks for making great content :*
Very cool. You know I’ve never actually wondered how they work. Then I saw this video and I was intrigued. Thank you. Gas pumps are much more complex than I thought.
Considering how many modules he made just to explain his discovery, this guy is qualified to be teaching in Physics class. Impressive work and welldone Steve.
Thanks for taking the time and puting the effort into explaining such a complex and smart design in simple to understand concepts, along with all the visuals to make it easy to understand. I always enjoy learning new things and I really enjoyed that one. Thanks!
Great video, Steve. Now for a challenge... some pumps the nozzle shuts off when the tank is not full, hence shutting off early, and you have to keep restarting the flow. What causes the nozzle to shut off early and what can be done by the person using the nozzle to allow them to fill their tank?
Awesome explanation, I understood all of it, thanks :) I've encountered numerous faulty pumps which click off too early. Then I figured out that if I "ride the biting point" softly with the trigger, I can coax it to flow despite the fault. What do you suppose is going on there? What's likely to be causing the issue, and why does "riding the biting point" work to resolve it?
I have worked as a mechanic and as an electrician for most of my adult life. Part of the fun of these careers is trying to figure out how things work. Most are pretty easy, however, I can remember a few times while pumping gas into my car that I thought about how those nozels worked. I thought a ventury and valve might have been involved, but never was able to tie it all together. Thank you for clearing all that up...Its always nice to see how things work. Well done!
@Corintur Back when I was a kid in the 50's and 60's I used to drive my parents nuts because I took just about everything apart and tried to but it back together. I succeeded most of the time, but there were a couple of times I made things a lot worse. We didnt have youtube back then and the stuff in the libraries was vague at best. I grew up trying to fix everything I owned and never threw anything away. As to compressed springs and stuff like that, I had a couple go flying across the room, but you learn to be careful over time. And yeah, I now have a ton of junk stacked in my garage from all the fixin, but now, I can call them all antiques and sell em on ebay!
@Danny Archer That is why you only do that with stuff you don't really care about or that is already broken. I never throw any device away before performing an "autopsy" on it. Though, I would still advise doing some research before dismantling something. Knowing about compressed springs, dangerous capacitors or possible toxic substances in certain components can save you a lot of pain. Besides, this is YT and it has its own version of Rule 34. If it exists, there is a video YT video of someone dismantling it.
That mechanism with ball bearings is very reminiscent of a roller-locked automatic firearm - rollers on the bolt stay pushed out and jammed into the frame (receiver) until the pressure in the chamber drops and it's safe for the action to open and cycle.
Pretty cool of you to cut one apart Steve! You can REALLY see why the handle gives that feeling of something "breaking" inside of the handle when the cut-off trips! I always kinda wondered why it felt that way.
The colour animations, the cut-away, and your crude models, has explained this handle so clearly! Now I understand these pump handles. Thank you for making this. 🇨🇦👍🏼
its a 14 min video but i've watched it for over an hour trying to really understand this. i've had this question since the first time i filled a car tank, and i am really into learning how things work. amazing video! learning new things is really fun
It was a fantastic visual video. As I understand it (and correct me if I'm wrong) the entire pump can be split into 3 parts 1) extern handle is pulled up which allow fuel to flow unrestricted through the handle and down the nose 2) once the fuel reaches the edge of the nozzle, it blocks a hole that allows that creates internal pressure within the handle (think blowing on a straw and then someone blocks one end of the straw, air stops and but now imagine there is a cut in the straw, the air your blowing now through the cut because one end is blocked) 3) the extra pressure releases a locking mechanism which makes it so the handle is no longer locked in place and the extra fuel that is sucked up is stored in a little gap or pocket This video explains why so much fuel exits the end of a fuel handle when no matter how much I've tried over the years, I could never quite get all the fuel out of the handle so there is no drip. It's cause it's stored in a little pocket until I change the angle how I'm holding a gas pump Next time I fill gas I'm going to try to keep this in mind and change how I hold the handle and see if I can use physics to have no drip....it's the little things in life lol
I’ve been wondering about the same question ever since I was 18. 15 years later, I accidentally found your video on my feed - what an awesome and clear explanation!! Thank you!!!
I have been wondering about this since I was a kid and over the years I also assumed it was an electrical sensor. I never wouldve imagined it's mechanical.
This is one of those things I've probably wondered about 100 times while pumping gas, but always forget about by the time I get home so I never looked it up. I'm glad you have finally answered this mini-mystery, and done such in a way that is intuitive and easy to understand! I always assumed it was probably some sort of electronic sensor, but this is far more clever!
Same, lol. I look up everything, but always forgot to look up how the mechanism functioned. I knew it was completely mechanical, not electronic and worked on a venturi effect. But wasn't sure how the venturi shuts off the flow/knows when to. Remarkably simple really. The impressive part and engineering, is how they cram it all into a handle. Fun fact, old time war planes could stall in a barrel roll or flying upside down, because the way their carbs. worked was also by venturi effect. And when the plane went upside down, it would screw up the effect and cause a stall. They overcame this problem with a modification to the venturi and no more stalls.
I would trust this simple mechanical system far more than if it was an electronic device. Technology has a history of being less reliable than simple mechanical devices.
This is probably the thing I have wondered about *the most* in the last ten years, that I have always forgot to look up. So it is incredibly satisfying to finally have an answer to it.
very good info indeed, i always wondered how the gas nozzle cut itself off, thanks for showing me this! , amazing engineering went into a nozzle like this , smart inventors out there!
I took one of these apart once in my auto tech class while I was bored (I had to wait for the rest of the class to catch up) but I couldn’t figure out how it stopped like that. Thanks for the explanation!
At 8:22, I instantly recognized what you created as a roller locking mechanism used in some automatic rifles. It's interesting to see two completely different machines use similar mechanisms to achieve similar goals.
Hi, Thanks for the explanation on how the delivery nozzle does the auto shutoff. I had a good idea how it worked. Seeing it makes it a lot easy to get one's mind around it.
I love these kinds of (fluid)mechanical solutions to problems. They always seem so intricate, but built off such simple elements. Great design, great video!
Thank you so much for the deep and clear explain, significantly answered me one of my most curious questions in my mind. Excellent implementation cutting out this real thing!
Goodness me who would have thought nozzles are so complicated! I always wondered how it all works and although I thought pressure is involved I didn't realise it was so intricate. It's actually extremely clever. Thanks for explaining.
What a genius and brilliant solution the humans came up with ! I always wondered how it shuts off automatically when the Gas tank is full. Thanks Steve for this video. ❤
Steve; I've got to say, when I saw all your models and the title of the video I was confused on how any of it made sense! But the way you explain it all makes everything fall into place, it's very impressive!
That was very interesting thanks! I always thought it must be some kind of pressure Venturi behaviour thing involving the hole at the end of the nozzle but had no idea how it actually worked!
Thank you. A wonderful explanation for a mechanism/physical property that not many have seen in everyday life. That showed how the tank being full stops the pump but on some pumps the stopping of the flow of gas/petrol from the pump also triggers the fulcrum release. How does that happen, since at that point there is no pressure differential from the fuel flowing?
That might be a mechanism with the modern electronics of prepay pumps. The gas station assumes you turning off the flow means you've finished your purchase, so their pumps probably have an electronic override when the flow stops. It's likely electronic since that override only gets disabled by the computer sending a signal to the pump to turn on after you've paid. If you've used a very old not prepaid pump, they don't have to be reset to continue the flow after being tripped (but they will still stop if they're experiencing a venturi siphon against a full tank).
Great video! Really enjoyed it. Explains things I've wondered about for a long time. Thank you. I watched an old Chevrolet video explaining how a differential works. You should explore them.
You have a great style of making these videos. 1 - You really struck gold with these 2D models, they show everything so nicely and without clutter 2 - You explain things in multiple different ways, which is helpful when someone doesn't get it the first time, and then would be confused for the rest of the video So thanks for showing off clever designs and physic principles in this way :D
Great video, Steve. I have a question I hope you or someone else can help with. I may have missed it mentioned in the video but isn't there something in the car's tank that also impacts the pressure? A car I had used to have an issue where, even if empty, the petrol pump would think it was full and never work unless I held it slightly out of the tank, presumably allowing a makeshift vent. I was told that there's a tube inside the car's tank acting as a pressure release system and can get blocked sometimes. Would that mean that, with the car tank's pressure release pipe blocked, it would have a big build up of pressure and therefore make the pump's Venturi system think the tank was full despite the fluid not being there to block the Venturi?
Now that was interesting. It seems like the workings are way more complicated then I thought. I wonder how difficult it was to invent such a device that we all take for granted today.
I respect the tremendous amount of time and effort you put in to the making of visual tools that you use to explain. There were at least 2 glass tubes, that green and red pipe stuff, the sawn in half nozzle, that mock up of the sawn in half nozzle and possibly more. Yet somehow, all I could do was to like, sub and share your video to my social media. I few that what I do isn't proportional to the amount of work you put in to this video and that is why I have mad respect for you. I thought I was a huge nerd, but I think I found a bigger one in you.
@Brian Merritt No, he's really not getting nearly as much money from KZclip as you think he is. He's almost certainly getting most of the money for this video through Patreon. Most KZclip users don't realize this, but KZcliprs need to have several sources of income (KZclip, Patreon, sponsors, merch, etc) because no one single source will provide enough money on its own.
@Brian Merritt It might be lucrative, but that doesn't negate the amount of the effort that went into the video. Sometimes the ability for a KZclipr to turn their videos into a career is at the whim of the mysterious algorithm.
I wouldn't worry too much, he's getting paid hundreds of thousands from KZclip for all the views he's getting from these videos. It's a full time job that pays very well.
Have you seen the "Open Circuits" book yet, Steve? Lots of electrical components cut in half so you can see them on a physical scale and how clever lots of them are. (like switches etc)
I am no engineer, technician or mechanic, but I have been taking things apart all my life to figure out how they work. Thank you for explaining it all so well.
Great video! Now understand how it’s supposed to work but I’m still curious about what’s going on when it doesn’t? My old truck had a habit of the gas flow shutting off well before it was full unless I was very careful to reduce the rate of flow from the nozzle, and I know someone who at least once has had gas come pouring out anyways- it never shut off for them. Any idea why these might have happened?
recently studied the venturimeter in high school. It's a hard concept and i thought why is this being tought? well, this video not only showed me the application, but also cleared my concept even further.
Wow, this was explained really well. I always wondered how the gas pump nozzle Venturi actually worked. It seems supper complex after watching this video. It goes to show that mechanical implementation of detection is preferred but there are too many nooks and crannies and if some part is not functioning properly there could be an overflow. I think electronics today can replace the mechanical implementation and would increase redundancy with lower failure rate.
Why use expensive and complicated electronics on a device that doesn't have a practical failure rate? If it isn't broke then don't fix it. You aren't going to perfect a device that is already perfect by adding complexity. It reminds me of the people who are constantly trying to get a patent on the wheel by adding a few electronic devices to it and then claiming that they improved it. They always get rejected for obvious reasons.
I tell you, if my professors had been as dedicated to explaining the venturi effect as you did in this video, I'd probably have picked up on a significant amount of the things they were teaching me. A lot of how aircraft work, is based around the venturi effect and the bernoulli principle because the one thing aircraft have in abundance, is air moving rapidly in a single direction lol.
I've looked into this before but not in as much detail. Thank you for the video. What still gets me is how fast it pumps. Amazing. I guess it's just good pumps.
If I've set things up right, the title of this video should say "gas" for US people, and "petrol" for UK people! If you're in one of those countries, can you confirm?
The sponsor is 80,000 Hours: head to 80000hours.org/steve to start planning a career that is meaningful, fulfilling, and helps solve one of the world’s most pressing problems.
I’m in South Africa and it says Petrol thanks
I'm in Netherlands and it says gas 🤔
Petrol in poland
i'm in canada and it says gas
unfortunately for me, a fellow bri'ish person, it shows gas.
It’s brave of you to think I can afford to fill my tank until the pump stops Steve lol
Jajajjajajjjajja
Geo Metros, not so much. And, it should go without saying that the safety of driving a smart makes a Metro seem terrifying in comparison. There is no reasonable comparison between the two.
@Goriller No, not really. A smart gets about 35 in city driving, low 40s on the highway. Those numbers are pretty easy to beat. But, buying a smart for gas mileage alone would be a mistake.
The mileage isn't terrible, but it's not the king of gas mileage either. They're a kick to drive though.
@smart451cab smart cars are the kings of gas mileage, or geo metros
@Goriller Hmmm, my smart's tank holds 8 gallons, and that's good for 300 miles. I even pay extra for premium fuel, sometimes for ethanol free fuel for an extra kick, without taking out a loan.
Plus, I get a roof over my head in rainy weather and air conditioning in hot weather.
I consider it my four wheel motorcycle, with benefits. And, it's a kick to drive with its paddle shifters and Porche worthy handling. Taking it into the mountain twisties and I can outrun all but the sports bikes, who are dragging their feet to keep up.
I’m a an engineer and I used to work for the company that originally created that design. Actually, I redesigned that ball bearing mechanism. I can confirm that you are correct in your assessment of how it works. Also, most gas nozzles have a second diaphragm or plunger (not membrane) that deflects when there is pressure in the fuel line. It is used for prepay fill up. When you hit the prepay amount the dispenser shuts off, the pressure in the nozzle drops and that second diaphragm which is spring biased up will move and shut the nozzle off. There is a third shutoff in some nozzles that is called an attitude device. When a … moron… pulls a flowing nozzle out of a car’s fill pipe, a ball bearing blocks the pickup tube and shuts the nozzle off.
Anti-moron mechanism lol
I'm the bearing and I can confirm this is a lie
Cool story Mr "I am an Engineer"
Please make a video about that too :P It's quite difficult to understand how prepay is hit and what happens when a moron pulls out a flowing nozzle out of the car.
Excellent explanation. It was worth the effort you put into that illustration. Thanks to that I have understood perfectly how something that I always ask myself works. You have made all of that seem so easy now, and it really is, but to most of us it seems more complex than reality. Thanks and greetings from Tampa, Florida.
I totally agree. I'm so impressed that he built the models & presented the effect so clearly. Very interesting - I'm a fan now.
I know! I was thinking "wow, I actually understand this model that he made."😂 Give him much props for that 👌
Pretty complex mechanism. I always thought it's somewhat simplier. Very good vid Steve.
It is simple. Basic pipe fitter knowledge
@Glum Reaper If it was so simple, in the old days they would have used the system to fill up their horses.
Its very simple mechanically if you think of the two parts as a sensor and a signal not to mention whatever it takes to close the valve. These gas pumps basically take a three part problem and use two mechanisms to solve all three. The beauty of the design is that both operate with only fluid dynamics. Most other sensors require a bit of chemistry or some other physical property (to detect a chemical presence) and a bit of electricity (to transmit the signal) as well as moving parts to operate the valve.
Many youtubers wouldn't have taken the time to craft the supplementary models that you made for this explanation, but I am SO GLAD you did. I'm a big visual learner and those models were excellent (and I can tell you had fun making them as well).Thanks for answering yet another question I didn't know I had!
Thank you for explaining this! These old mechanical techniques of automation are fascinating!
As a (retired) technology teacher, I can respect the huge investment in time and energy needed to make and test those models. Also your perspex models are getting better as you learn. Good jobs all round.
@ALakes Show us your data demonstrating that "teachers have to announce they are a teacher everywhere they go". How would you know all the times that teachers did not announce their professions? Sad (apparently).
@ALakes It's enormously relevant here though isn't it.
@Donald Sayers I never said I had a poor opinion of the profession. I find it funny yet sad that teachers have to announce they are a teacher everywhere they go. It's a simple observation.
@ALakes Given that what I did was exactly making perspex models to demonstrate things, I thought it relevant. I'm sorry you have such a poor opinion of the profession, but being retired I can now forcefully suggest where you can stick your opinion. Ooh dark sarcasm...
Teachers always tell you they are/were a teacher... Everywhere teachers go they have to announce they're a teacher. Its sad.
As a sales engineer I find it amazing how you drive us through the explanation and build up the complexity of it. I'm learning more than just how gas pumps work!
As a chemical engineer, it is a very great demonstration and it’s fascinating how in depth you went with the Bernoulli effect, great work!
The mechanism is both elegant yet high complex, and understandable thanks to all the detail and props Steve included. Well done!
Your vids help me learn physics in a way my college classes couldn't. Even though this was a lot to follow and kind of hard, it all clicked in the end and I feel so excited to know how this system works 😊
This is such a clever combination of principles but the most impressive thing for me is the way it was explained. This is the best step by step breakdown of any educational topic I’ve ever seen. Not one of the best, the best! Every time a side issue that could have scuppered things arose it was dealt with before it could be a factor that might throw you off course. Congratulations on this level of understanding of not only the things you are explaining but also the human learning experience. Top class!
This is one invention that never seems to fail. It's never failed for me and I'm 66 years old. I've never seen or heard of this valve not working from other people either. That's quite a successful bit of engineering, I'd say.
@aapddd not in Indian movies tho
@antiisocial Great tip. Everyone should do what you do for the sake of safety, just in case.
I've had one fail once on me about 12 years ago and I saw it fail one other time for someone else just a couple of months ago. Both times gas went everywhere. I always stay and wait for it to stop.
unfortunately they do fail it is just that gas stations have maintenance that goes on. I try to get there really quickly everyday of the week, rain or shine. when a service call comes in and I switch out the nozzles all the time due to failure of the valves and leaks that occur within them.
I've seen it fail before. Had goes everywhere, lol.
Great video. What I like about this mechanism is how non-electric this is. You have to admire engineers that developed that back in the days. Nowadays I got impression everything needs to be computer controlled. This mechanism shows us what true engineering is and it is uncanny.
My parents ran a gas station and I helped them since I was a child. Your explaination helped me understand a phenomenon I experienced many times in my first twenty years of life! Very ingenious, hope someone was rewarded for this mechanism. Nice video and very good explaination, thanks!
Amazing how the small differences in pressure are utilized to trip simple mechanisms and close off the primary valve when your tank is full. Awesome, thanks so much for this!
All my life I’ve spent half of my time at the pump wondering how this worked!! Thanks for finally letting me know 😁
Thanks for explaining something that I briefly wonder about when filling up, and then forget about when I drive off. Now I will always know what happens!
You can feel the petrol (water) hammer/hydraulic shock when the pump shuts off as the valve closes as well. Always wondered about that, cheers Steve this was really interesting
@Kablamityful that isn't "technically correct" though. It's water hammer
It's an amazing device. You would think there are a bunch electronic stuff to make it work, but all it require is the understanding of physic and some very clever engineering and design.
I always assumed that was just the force of the valve "slamming" shut in order to avoid leaks/price discrepancies. I suppose that is still technically correct (the best kind of correct) but more-so as a happy accident. Good to know that it was actually a safety valve. As I've said time and again when someone (usually a boss) complains about fire safety. "Fire safety is paid for in blood." Meaning we don't get these rules and functions without a lot of deaths first.
@Steve Mould you should make a video about 'hydraulic ram pump'.
@Agustin Campeny The constriction at the base of the hose, as Steve pointed out at 3:37. It's spring loaded so it's normally closed if there's no pressure from the flow. If you meant the handle, it just the springs at both column that also normally close and will put the handle lever down if you not holding it (or prep it with the tiny metal piece on the handle).
This is fascinating. I think a part 2 would be interesting showing how they activate and deactivate the pumps
Excellent technical explanation.The time and effort you put in resulted in a very clear and understandable process of how a fuel shutoff mechanism works. Terrific job!
I've wondered about how gas pump nozzles work for most of my life but never bothered to look into it. Great video and easy to understand. Thanks for putting this together.
Wow! There is a ton of engineering that goes into that gas pump. Thank you for the lesson 🙏
This is an excellent explanation. I knew that the valve was controlled by a venturi-generated pressure differential, but never took the time to understand the actual mechanics of the fluid passage and the shutoff trigger. Really well explained here.
The fact that this is all done mechanically and not electronically is what makes this so cool to me
I wouldn't be surprised if there are electronic components to some these days or in the near future.
But these automatic shutoffs long predate the cheap and widely available integrated circuits we have today to enable us to computerize everything. These cutoffs were used before electronic displays became common.
/I had always assumed it was based on a float, though
Want your mind blown? Look for videos on mechanical targeting computers.
can it make the fuel free?
Many principles that would function forever with repair that a craftsman can do will be replaced by digital stuff that needs from now on monetarized upgrades from above. That's cool for the big players.
Great video with very good illustrations and descriptions. I always had some idea of how I thought it worked (I assumed some sort of cam and/or clutch mechanism paired with some kind of air pressure sensitive system) and it was nice to finally understand. Thank you for the explanation.
Fascinating video! I love the way you explain this, and the mock ups you used. Really nice work! Thank you for sharing this. I've always wondered how they work.
that mightve been one of the most interesting youtube videos i've ever seen and believe me i've watched a lot. spectacular job at coming up with the models to explain the mechanisms. thank you!
Now I know how they work. Love your explanation and how you teach. Keep up the good work!
Holy cow, that was an amazing video explaining all the different pressure effects and illustrating it with amazing models. I always love your channel, but I just wanted to say this one was pretty cool!! Great job on the effort!
I remember looking up how this worked a few years back. The fluid dynamics and drawings went way over my head and I was left confused. Incredibly impressed (but not surprised) that you managed to clearly explain the mechanism to a total lay person in just over ten minutes!
@Micah Philson waste of time, people that see ghost where there aren't, better the invent something on your own and hope that it sells. they asked me as well when i was 18 and i told them you must be joking, you must be out of your mind and they left me alone, recently i got to speak to one of these people, lol.
@Analog Dude I'm in a military training program, we're only learning about the systems and the theory behind the systems we use, and working practically with those systems. We're taught by people with like at least 6+ years of experience, not professors.
But to do it, we have to learn all the theory and physics, chemistry, materials science, fluid dynamics, engineering etc. behind it all because it's literally nuclear physics and nuclear power.
@Micah Philson because "highly" educated people think to complex, i follow a professor here on tube, it's pretty much theory, but no practical experience and rather clumpy.
they have a star mind, not really open for new things and ideas, than someone without a university degree comes along and leaves the professor stunned and in the dust.
you shouldn't really admire these people, they aren't really smart al better at numbers because of routine. they can't solve simple things.
I read a youtube comment about it a couple days ago and didnt really understand it. The visual explanations really helped it click all together!
I've been going through an engineering course over the last couple years, and I've learned a ton about fluid physics and dynamics. This video covered so much of those classes all at once and explained it all so clearly and succinctly, such in-depth topics so concisely, he makes it look easy! This video is incredibly well done!
This is the most intuitive and thoughtful explanation I have ever seen. I knew about this Venturi affect in fuel pump model but I never understood it completely as there was always some element of doubt on my mind until I saw your video. This is so satisfying now for me. Tremendous effort in putting this video. A ton of thanks.
Fantastic video. Always wondered this. Love seeing the engineering behind this.
Este invento es una genialidad que pasa inadvertida a diario. Gracias por esta excelente explicación. Has ganado un suscriptor más 👏🏆
What a beautiful and clear explanation of such a difficult and clever mechanism.
Thank you very much!
You did a good job. A layman explaining principals of hydraulics with no engineering experience in the field is challenging for sure.
I was mentored by the two engineers who patented this back in 1965 and worked with them for over three years. They are both gone now, but they gave me a lot of knowledge during that time. One was like a second father to me and he was as detailed and meticulous as one could be. They two men didn't get much out it as like most corporations do, the board takes it all for themselves.
Actually - -The fuel shut-off valve was invented in Olean, New York, in 1939 by Richard C. Corson. At a loading dock at the Socony-Vacuum Oil Company.
If they worked for a company when they invented it then yeah, obviously the company they work for would OWN the invention. If you truly want to make a lot of money from something you invented you have to do it yourself and then sell it to a corporation/company. Not sure why you seem to imply they should have gotten more from their invention. When you work for a company they pay you and give you the resources needed to create and invent the thing you've been tasked to create. Usually you sign something when you work somewhere that anything you invent as a result of your employment is owned by the company. It's not as if the board swoops in and is like SURPRISE! THIS IS OURS NOW!!! MWAHAHA!
@Karl Schneider Why is it sad? You voluntarily agreed to work for a company. You signed a contract out of free will to receive money in exchange for work. You did the work as agreed and then you were paid as agreed.
I don't see anything wrong.
Always wondered how these worked. It's an astonishingly reliable mechanism. Having worked in a fuel station I have seen them fail to stop on occasion. mostly in the winter months.
Man i'm glad you and the other more common guests on Numberphile have your own channels a lot of the things you guys talk about is so interesting.
I do love a well designed mechanical solution. thanks for taking the time to explain this. I thought it was something related to pressure and valves, but never imagined the system was this complex.
Oh man. I found this channel a while ago and it just feels like a science show I always watched as a kid, but like...for adults. Thanks for making great content :*
Explicación brillante. Siempre me pregunté cómo funcionaría 👏🏼
I am fascinated by how much simple technologies are put together inside that thing and how hard it is to explain how they interfere with each other…
Hey Steve I would like you to explain Genesis chapter 1 through chapter 11.
Thanks for your video
Well, it is multiple simple devices put together to make a somewhat complex device.
Some people can explain in 2 minutes what others take 2 hours to do.
Interact*
Very cool. You know I’ve never actually wondered how they work. Then I saw this video and I was intrigued. Thank you. Gas pumps are much more complex than I thought.
Considering how many modules he made just to explain his discovery, this guy is qualified to be teaching in Physics class. Impressive work and welldone Steve.
Thanks for taking the time and puting the effort into explaining such a complex and smart design in simple to understand concepts, along with all the visuals to make it easy to understand. I always enjoy learning new things and I really enjoyed that one. Thanks!
Great video, Steve. Now for a challenge... some pumps the nozzle shuts off when the tank is not full, hence shutting off early, and you have to keep restarting the flow. What causes the nozzle to shut off early and what can be done by the person using the nozzle to allow them to fill their tank?
Awesome explanation, I understood all of it, thanks :) I've encountered numerous faulty pumps which click off too early. Then I figured out that if I "ride the biting point" softly with the trigger, I can coax it to flow despite the fault. What do you suppose is going on there? What's likely to be causing the issue, and why does "riding the biting point" work to resolve it?
I have worked as a mechanic and as an electrician for most of my adult life. Part of the fun of these careers is trying to figure out how things work. Most are pretty easy, however, I can remember a few times while pumping gas into my car that I thought about how those nozels worked. I thought a ventury and valve might have been involved, but never was able to tie it all together. Thank you for clearing all that up...Its always nice to see how things work. Well done!
im a 12 year old kid from austria we learn how this work for early morning classese hahahah
@Nostalgic Bliss was gonna say that, it's just different kinds of people
@Danny Archer That's why you're not an engineer
@Corintur Back when I was a kid in the 50's and 60's I used to drive my parents nuts because I took just about everything apart and tried to but it back together. I succeeded most of the time, but there were a couple of times I made things a lot worse. We didnt have youtube back then and the stuff in the libraries was vague at best. I grew up trying to fix everything I owned and never threw anything away. As to compressed springs and stuff like that, I had a couple go flying across the room, but you learn to be careful over time. And yeah, I now have a ton of junk stacked in my garage from all the fixin, but now, I can call them all antiques and sell em on ebay!
@Danny Archer That is why you only do that with stuff you don't really care about or that is already broken. I never throw any device away before performing an "autopsy" on it.
Though, I would still advise doing some research before dismantling something. Knowing about compressed springs, dangerous capacitors or possible toxic substances in certain components can save you a lot of pain.
Besides, this is YT and it has its own version of Rule 34. If it exists, there is a video YT video of someone dismantling it.
Very well explained thanks for the video. As a gasfitter working with regulators and valves I found this very interesting
Incredible stuff !
Who would believe it's that complex to fill up your car !
That mechanism with ball bearings is very reminiscent of a roller-locked automatic firearm - rollers on the bolt stay pushed out and jammed into the frame (receiver) until the pressure in the chamber drops and it's safe for the action to open and cycle.
absolutely brilliant, not just the mechanism, but your explanation as well, thank you
Pretty cool of you to cut one apart Steve! You can REALLY see why the handle gives that feeling of something "breaking" inside of the handle when the cut-off trips! I always kinda wondered why it felt that way.
The fact that you made a see-through, 2D version makes me unbelievably happy! Well done good sir
@Andreas Gurdel haha, excellent comment!
Luckily this is not Matt Parkers channel. His stuff is great too, but he would make a 4D version that clarifies nothing.
Steve always makes see-through 2D versions!
The colour animations, the cut-away, and your crude models, has explained this handle so clearly! Now I understand these pump handles. Thank you for making this. 🇨🇦👍🏼
I was always curious on these pump nozzles, thanks for fulfilling my curiosity and such a good explanation
its a 14 min video but i've watched it for over an hour trying to really understand this. i've had this question since the first time i filled a car tank, and i am really into learning how things work. amazing video! learning new things is really fun
It was a fantastic visual video.
As I understand it (and correct me if I'm wrong) the entire pump can be split into 3 parts
1) extern handle is pulled up which allow fuel to flow unrestricted through the handle and down the nose
2) once the fuel reaches the edge of the nozzle, it blocks a hole that allows that creates internal pressure within the handle (think blowing on a straw and then someone blocks one end of the straw, air stops and but now imagine there is a cut in the straw, the air your blowing now through the cut because one end is blocked)
3) the extra pressure releases a locking mechanism which makes it so the handle is no longer locked in place and the extra fuel that is sucked up is stored in a little gap or pocket
This video explains why so much fuel exits the end of a fuel handle when no matter how much I've tried over the years, I could never quite get all the fuel out of the handle so there is no drip. It's cause it's stored in a little pocket until I change the angle how I'm holding a gas pump
Next time I fill gas I'm going to try to keep this in mind and change how I hold the handle and see if I can use physics to have no drip....it's the little things in life lol
I’ve been wondering about the same question ever since I was 18. 15 years later, I accidentally found your video on my feed - what an awesome and clear explanation!! Thank you!!!
I have been wondering about this since I was a kid and over the years I also assumed it was an electrical sensor. I never wouldve imagined it's mechanical.
where is the wire hidden/
This is one of those things I've probably wondered about 100 times while pumping gas, but always forget about by the time I get home so I never looked it up. I'm glad you have finally answered this mini-mystery, and done such in a way that is intuitive and easy to understand!
I always assumed it was probably some sort of electronic sensor, but this is far more clever!
@martino amello The action just suggested won't work as the pump will just shut off when it meets a full object (ie the nut holding it) LOL
Same, lol. I look up everything, but always forgot to look up how the mechanism functioned. I knew it was completely mechanical, not electronic and worked on a venturi effect. But wasn't sure how the venturi shuts off the flow/knows when to. Remarkably simple really. The impressive part and engineering, is how they cram it all into a handle. Fun fact, old time war planes could stall in a barrel roll or flying upside down, because the way their carbs. worked was also by venturi effect. And when the plane went upside down, it would screw up the effect and cause a stall. They overcame this problem with a modification to the venturi and no more stalls.
you’re really not pumping it but just opening a valve 😅
I would trust this simple mechanical system far more than if it was an electronic device. Technology has a history of being less reliable than simple mechanical devices.
This is probably the thing I have wondered about *the most* in the last ten years, that I have always forgot to look up. So it is incredibly satisfying to finally have an answer to it.
very good info indeed, i always wondered how the gas nozzle cut itself off, thanks for showing me this! , amazing engineering went into a nozzle like this , smart inventors out there!
I took one of these apart once in my auto tech class while I was bored (I had to wait for the rest of the class to catch up) but I couldn’t figure out how it stopped like that. Thanks for the explanation!
At 8:22, I instantly recognized what you created as a roller locking mechanism used in some automatic rifles. It's interesting to see two completely different machines use similar mechanisms to achieve similar goals.
that's it, I was trying to think of where id seen that lock before... on a mg42!
came to say that, it looks like an hk lol
Wow that is extremely complex! Love the level of genius that goes into everyday objects
Hi, Thanks for the explanation on how the delivery nozzle does the auto shutoff. I had a good idea how it worked. Seeing it makes it a lot easy to get one's mind around it.
I love these kinds of (fluid)mechanical solutions to problems. They always seem so intricate, but built off such simple elements. Great design, great video!
And so robust , too!
Thank you so much for the deep and clear explain, significantly answered me one of my most curious questions in my mind. Excellent implementation cutting out this real thing!
Goodness me who would have thought nozzles are so complicated! I always wondered how it all works and although I thought pressure is involved I didn't realise it was so intricate. It's actually extremely clever. Thanks for explaining.
What a genius and brilliant solution the humans came up with ! I always wondered how it shuts off automatically when the Gas tank is full. Thanks Steve for this video. ❤
This is simply genius! Thanks for explaining it in details.
Steve; I've got to say, when I saw all your models and the title of the video I was confused on how any of it made sense! But the way you explain it all makes everything fall into place, it's very impressive!
*Standing Ovation* This was an incredibly thorough and intuitive explanation. Thank you Steve!
@GuyJustCool For those topics, I think ScienceClic does the best job one could possibly do.
If somebody could understand and explain quantum physics, it’s this man. Thanks, Steve, amazing, as always.
A M A Z I N G
Welcome to the channel!
Kudos on all the effort you put into making this video!
Something you use everyday but never stop to think how it works. Good job in explaining.
That was very interesting thanks! I always thought it must be some kind of pressure Venturi behaviour thing involving the hole at the end of the nozzle but had no idea how it actually worked!
Thank you. A wonderful explanation for a mechanism/physical property that not many have seen in everyday life. That showed how the tank being full stops the pump but on some pumps the stopping of the flow of gas/petrol from the pump also triggers the fulcrum release. How does that happen, since at that point there is no pressure differential from the fuel flowing?
That might be a mechanism with the modern electronics of prepay pumps. The gas station assumes you turning off the flow means you've finished your purchase, so their pumps probably have an electronic override when the flow stops. It's likely electronic since that override only gets disabled by the computer sending a signal to the pump to turn on after you've paid. If you've used a very old not prepaid pump, they don't have to be reset to continue the flow after being tripped (but they will still stop if they're experiencing a venturi siphon against a full tank).
Great video! Really enjoyed it. Explains things I've wondered about for a long time. Thank you. I watched an old Chevrolet video explaining how a differential works. You should explore them.
You have a great style of making these videos.
1 - You really struck gold with these 2D models, they show everything so nicely and without clutter
2 - You explain things in multiple different ways, which is helpful when someone doesn't get it the first time, and then would be confused for the rest of the video
So thanks for showing off clever designs and physic principles in this way :D
Great video, Steve. I have a question I hope you or someone else can help with. I may have missed it mentioned in the video but isn't there something in the car's tank that also impacts the pressure? A car I had used to have an issue where, even if empty, the petrol pump would think it was full and never work unless I held it slightly out of the tank, presumably allowing a makeshift vent. I was told that there's a tube inside the car's tank acting as a pressure release system and can get blocked sometimes. Would that mean that, with the car tank's pressure release pipe blocked, it would have a big build up of pressure and therefore make the pump's Venturi system think the tank was full despite the fluid not being there to block the Venturi?
Me and my dad were discussing this recently, thanks for the explanation 😃
Had this thing in my hand all the time. Thanks for explaining it so well!
Love your stuff, Steve. This one is brilliant. Thank you.
Now that was interesting. It seems like the workings are way more complicated then I thought. I wonder how difficult it was to invent such a device that we all take for granted today.
I respect the tremendous amount of time and effort you put in to the making of visual tools that you use to explain. There were at least 2 glass tubes, that green and red pipe stuff, the sawn in half nozzle, that mock up of the sawn in half nozzle and possibly more. Yet somehow, all I could do was to like, sub and share your video to my social media. I few that what I do isn't proportional to the amount of work you put in to this video and that is why I have mad respect for you. I thought I was a huge nerd, but I think I found a bigger one in you.
If you really want to do more to support the channel, consider contributing as a patron on Patreon.
@Brian Merritt No, he's really not getting nearly as much money from KZclip as you think he is. He's almost certainly getting most of the money for this video through Patreon. Most KZclip users don't realize this, but KZcliprs need to have several sources of income (KZclip, Patreon, sponsors, merch, etc) because no one single source will provide enough money on its own.
@Brian Merritt It might be lucrative, but that doesn't negate the amount of the effort that went into the video.
Sometimes the ability for a KZclipr to turn their videos into a career is at the whim of the mysterious algorithm.
I wouldn't worry too much, he's getting paid hundreds of thousands from KZclip for all the views he's getting from these videos. It's a full time job that pays very well.
Kudos to the incredible engineers who made this all possible that we now take for granted.
Oh wow that's very clever indeed! And thank you for putting in all these efforts to demonstrate it. They made it really easy to understand!. Thanks!
Neato! I knew that the venturi principle was part of the operation but never quite knew how the mechanics worked!
Now I know!
Have you seen the "Open Circuits" book yet, Steve? Lots of electrical components cut in half so you can see them on a physical scale and how clever lots of them are. (like switches etc)
This design is absolute genius. Well explained.
I am no engineer, technician or mechanic, but I have been taking things apart all my life to figure out how they work. Thank you for explaining it all so well.
I like to take things apart. But, when i try to put it back together, i always get some extra screws.
@Max A he didn't say he was a puter back togetherer.
Did u put them back together afterwards?
Great video! Now understand how it’s supposed to work but I’m still curious about what’s going on when it doesn’t? My old truck had a habit of the gas flow shutting off well before it was full unless I was very careful to reduce the rate of flow from the nozzle, and I know someone who at least once has had gas come pouring out anyways- it never shut off for them. Any idea why these might have happened?
Great explanation! It's incredible to think that this was invented decades ago
Excellent content! Very well explained, demonstrated.
recently studied the venturimeter in high school. It's a hard concept and i thought why is this being tought? well, this video not only showed me the application, but also cleared my concept even further.
Wow, this was explained really well. I always wondered how the gas pump nozzle Venturi actually worked. It seems supper complex after watching this video. It goes to show that mechanical implementation of detection is preferred but there are too many nooks and crannies and if some part is not functioning properly there could be an overflow. I think electronics today can replace the mechanical implementation and would increase redundancy with lower failure rate.
Why use expensive and complicated electronics on a device that doesn't have a practical failure rate? If it isn't broke then don't fix it. You aren't going to perfect a device that is already perfect by adding complexity. It reminds me of the people who are constantly trying to get a patent on the wheel by adding a few electronic devices to it and then claiming that they improved it. They always get rejected for obvious reasons.
I tell you, if my professors had been as dedicated to explaining the venturi effect as you did in this video, I'd probably have picked up on a significant amount of the things they were teaching me. A lot of how aircraft work, is based around the venturi effect and the bernoulli principle because the one thing aircraft have in abundance, is air moving rapidly in a single direction lol.
@Cookiez __ wings fly because of both Bernoulli's principal and Newton's third law.
@Dr. Love And you get to learn it again in college. You should know this doc!!
Professor? We learn this stuff in high school.
@Julian Brelsford Unfortunately wings do not fly because of bernoulli's principle (and as such the venturi effect), its a misconception.
Venturi effect is how carburettors work, too.
I've looked into this before but not in as much detail. Thank you for the video. What still gets me is how fast it pumps. Amazing. I guess it's just good pumps.
Really great video!
You did a good job explaining it.🎉