August 1st, 2015, 06:01 PM | #1 |
Daily Ninjette rider
Name: Hernan
Location: Florida
Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot.
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How does a gas pump shut off automatically when the gas tank is full?
Copied from
http://www.pa.msu.edu/sciencet/ask_st/122591.html When your gas gauge reads empty, your tank is filled with air instead of fuel. As you add fuel, the air must move out of the tank to make way for the gas. Next time you fill your car at the gas station, take a look at the pump nozzle. You will find a hole about a half inch from the end of the nozzle. This hole is connected to a small pipe that travels through the nozzle to the handle. When you fill your gas tank, some of the displaced air flows through the hole in the nozzle into the pipe. When the tank is full, the hole will be below the gasoline level and no air will pass through the pipe. A mechanical switch inside the nozzle detects when the flow of air stops and shuts off the gas. You may have noticed that, after the pump shuts off, you can get more gas in your tank by pulling the nozzle out of the tank a bit. This is because you are moving the position of the hole relative to the gas level and allowing the mechanical switch to reopen. Conklin also explained how the replacement of the hole controls how full the tank can get before the pump shuts off. For example, fuel oil tanks typically hold about 275 gallons of fuel. The filling mechanism indicates that the oil flow should be shut off when the tank is about 25 gallons short of being full to allow for fuel expansion as the temperature increases. Auto fuel pumps also must be set so they leave a little extra room. Learn more about gasoline dispensers: https://en.wikipedia.org/wiki/Fuel_dispenser
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August 1st, 2015, 06:13 PM | #2 |
ninjette.org member
Name: D.
Location: Boca Raton, Florida
Join Date: Jan 2015 Motorcycle(s): 2015 Ninja 300 ABS Posts: 86
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Very cool. But NOTHING is more annoying than the pump that clicks off with every drop of gas it pumps. Like the minute it starts flowing gas, CLICK. Ugh...so annoying!!!
(Sorry, please excuse this slight venting episode. We now return to regularly scheduled discussion). D. |
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August 1st, 2015, 10:06 PM | #3 | |
ninjette.org member
Name: G Money
Location: Houston
Join Date: Jun 2015 Motorcycle(s): That's a silly question Posts: 17
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August 2nd, 2015, 08:22 AM | #4 |
٩(͡๏̯͡๏)۶
Name: asdfman
Location: SF, CA
Join Date: Nov 2014 Motorcycle(s): 09 Ninja 250 held together by duct tape and zip ties Posts: 122
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Why does this happen? Does it mean the hole the air goes through is clogged? It happened to me once before. I just told the gas attendant then moved on to another pump.
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August 2nd, 2015, 04:12 PM | #5 | |
ninjette.org member
Name: D.
Location: Boca Raton, Florida
Join Date: Jan 2015 Motorcycle(s): 2015 Ninja 300 ABS Posts: 86
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