When attempting to refuel my vehicle at the gas station, the fueling pump shuts off after about 30 seconds (as if the tank is full). Knowing the tank is not full, I wait a few seconds then add more fuel until it shuts off again (usually 30 seconds later).
by 
Willpower365
ANSWERS: 4
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Suggestion: Don't start it off at full speed. Start off slow, and build it up to lock it on. The latter will help the gas start into tank, and, I think, help create a "suction" to pull the gas down. If you start off too fast, it's like a flash flood at a culvert... It will back up the pipe. THAT'S what stops the flow.
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Gas pump fuel nozzles have sensors that read fuel vapors. they shutoff automatically in order to prevent a spillage of fuel and possible fire. Its a safety factor. After a while, some of the sensors go bad, just like everything else. You might tell the owner of this problem. In the meantime, use another fuel pump.
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As you pump fuel into the tank, it displaces a mixture of air and fuel vapors. These vapors need to go somewhere. If they can't go anywhere, then the fuel cannot enter the tank, it backs up in the filler tube, the station nozzle senses the backup, and it shuts off. There is a system on the vehicle designed to absorb these vapors, then feed them into the engine to be burned as part of the fuel-air mixture. That system, usually called the "evaporative emissions system" is malfunctioning. Have a competent mechanic inspect it.
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John P. knows his stuff about shutoff valves. 35 years ago service stations were not self-service. The attendant would pump your gas and, while you waited, squeegee your windshield. Even then the shutoff valve took care of stopping the fuel flow if that tank filled while the attendant was steps away. Shutoff valves tended to work 98% of the time. When they didn't, fuel would keep gushing, creating a fire hazard. They have improved since. If the problem follows more than one pump then there could be something between the shutoff and your tank. Try a pump without one of those rubber sleeves. Shutoff valves often have 3 settings for different flow rates. Try a medium or low flow rate instead of a fast one if you have not done so already.
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