Take the gas cap off and drive and see if it runs out of fuel and dies. If it doesnt then it's not a vacuum problem in the tank. I'm thinking a gas cap allows air in but not out, a one-way valve. I guess it depends on the condition of the cap. That hiss you sometimes hear when you pull the cap off to refuel is a vacuum pulled in the tank by the pump and the fuel vapor solenoid on the engine. I find it hard to believe the pump could quit pulling fuel for that reason.


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