Most commonly, the culprit is just some gasoline splashing back enough to block that hole momentarily, triggering the cutoff. Now, the question is why is it splashing back? In that case, you can try adjusting the trigger setting to a lower notch, or squeezing it less with your hand, or possibly angling the fill nozzle to give the little breather hole a better chance of not getting splashed or submerged by gasoline.
If none of that works, try another gas station that may have slower-flowing pumps. I guess if you were really, really desperate and had a real contempt for safety, you could maybe rig up a little snorkel device that would fit over the end of the nozzle and give the cut-off sensor an uninterrupted flow of air, no matter what.
Fuel tanks have venting lines that can get clogged or blocked; in cases like this, the situation caused by fuel back-up in the fill pipe can happen, since the clogged vent line will prevent rapid refilling, and that can trigger the shut-off valve. So, there could be something wrong with the car, specifically, the vent line. If this happens a lot to you and you have a car with a long filler tube, that could be worth looking into.
The most common culprit that we see for a PSO is a damaged nozzle from the gas station. Posted September 19, Never had this issue before.
Link to comment Share on other sites More sharing options Catlover Posted September 19, Wiz Posted September 19, Wiz confirms that. Posted September 21, Thanks everyone! Eddie G Posted September 21, Aygo22 Posted August 3. Posted August 3. He is right, am having the same problem with my Toyota aygo I tried different pumps different stations and even asked other aygo drivers.
Vandals01 Posted August 3. PetrolDave Posted August 4. Posted August 4. Gas is likely getting backed up somewhere between the filler neck and the gas tank. Think of trying to pour wine back into a wine bottle — if you pour too quickly, the wine gets caught in the narrow neck.
So, gasoline rushes back up your car's fuel filler tube, toward you, instead of into the tank, hits that sensor hole on the nozzle and shuts off the pump before the tank is full. The neck or rubber hose to the tank could be partially collapsed or there could be something blocking the filler neck, Brown-Harrison says.
Another possibility? The gas could be backing up because of some kind of restriction in the evaporative emission control system EVAP , which traps out gasoline vapours evaporating from the tank and keeps them from entering the atmosphere. Or, if it always happens at the same gas station, the flow from the pump might be too fast — and again, the gas backs up and shuts off the nozzle, Blum says. If the gas is especially foamy, it could shut the pump off early, said the Straight Dope's Cecil Adams in a explanation of how pumps shut off.
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