When fueling, the gas tank backs up & cuts off nozzle.
My 2001 Toyota Corolla cuts the nozzle off 3 or 4 times each gallon while fueling, no matter how much is already in the tank. I took it to a mechanic who replaced the fuel tank vent, stating that it looked like it was stuck. That did not solve the problem. The mechanic also said that nothing else seemed wrong. The filler tube was clear, no obstructions. He doesn't know what is causing the problem. Can you help?
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Check that the flap/valve that moves aside when you insert the fuel nozzle is moving fully. Also check the rubber tube on inside of the fuel filler cap to the tank is ok .. and often, there may be a thinner tube that acts as a vent... check the vent tube (if fitted).
When you fill your car with fuel the back pressure from the vehicle fuel tank causes the fuel nozzle to cut out and stop delivering. This is just a safety feature. Every fuel nozzle in the world is the same..
You don't have a big problem. Next time you refill with fuel try delivering in short 'spurts' .. pull the trigger for a few seconds and then release .. pull again ... Let the pressure in the tank drop between spurts. Don't shove the nozzle into the fuel filler and try and blast gallon after gallon into the tank.
I'm in the UK. I have a 1998 Jeep. Every time I fill it with gas it takes a while and my wife phones the police to report me missing from home... You don't have a problem. Fill it with spurts..
check that the air hose from the tank to the top of the filler pipe is not squashed or crimped by something like a zip tie. This hose allows the air in the tank that is being displaced by incoming fuel to vent at the top of the filler tube and not past the filler nozzle thereby switching it off.
Many vehicles have a rubber hose between the filler tube on the body and the gas tank. Check that it's not collapsed or that something maybe got in there and squeezed it partially shut. The rubber tube may need replaced. Please rate this answer, thanks.
There should be an air vent coming from the top of the gas tank back to the top of the fuel tank. Possibly kinked or pinched, try pulling the fuel nozzle about half way out and filling the tank on the lowest setting the fuel pump will let you.
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The pump is shutting off because of back pressure. There are usually two lines going to the fuel pipe. The big pipe that the gas goes down and a smaller vent pipe that the air that is being displaced in the tank comes up. If this is blocked or is not working correctly , enough pressure can build up to shut off the nozzle of the gas pump. The gas nozzle thinks your tank is full.
Same problem yesterday on my Dad's Jimmy. Left my brother in law stranded cause they couldn't put gas in it. There is a pressure purge valve next to the tank that is supposed to release the pressure on the tank when the engine is shut down. These often fail in Jimmy's and Blazer's and because the tank is still pressurized, the antisiphon valve doesn't open up and this keeps you from putting gas in the tank. You need to replace the part.
The "new style" fuel nozzles have a "detector" built in to stop the fuel delivery by the amount of air pressure being forced up from the level of fuel in the tank; this prevents spillage. I had the same problem, but, I noticed that I was NOT jamming the rubber thingy on the nozzle all of the way up against where the cap screws on. After I jammed it all of the way in, the problem was eliminated. Try that, I think yopu will be OK.