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1994 968 Fuel tank vacuum

Fuel System

Vehicle Information: Model(924/944/968): 968; Year: 1994; Body Type: Coupe; Total Mileage: 54000;

The "woosh" of air entering the filler pipe stopped happening recently. Suspecting the seal, I reversed the gasket on the filler cap, but no change. What are the usual suspects?Occasionally, the fuel pump buzzes loud enough to hear inside the car, and may continue doing so for quite a while. Might these two conditions be related?

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