Sometimes the pump dispenses gas too quickly. But if happens at other stations, it can mean the fuel vent system is clogged. Have your mechanic inspect it.
If it does this while the gas pump nozzle is in the filler tube all the way then pull the nozzle outward just a about a one quarter of an inch to half inch at a time until it fills correctly but not out so far as to let fuel spray out of filler tube, sometimes you can have the nozzle to far in you still want it in there far enough to protect you in case it back flushes gas out at you.
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