When pumping gas the fuel spills out after a few seconds. Even though not full. on 2000 Chevrolet Express 1500

This happens every time i try to fuel up.

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2 answers
Check for obstructions in the fill tube. There is also something in there that prevents fuel vapor from escaping. its part of your EVAP system. That could be malfunctioning.
i think there is a part to keep gas from coming out if veh. is flipped over, might be stuck.