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Fuel Tank Pressure

Fuel System

Vehicle Information: Model: 911SC; Year: 1979; Body Type: Coupe; Total Mileage: 98250;

At times the fuel filler cap is impossible to spin off. When it does release, there is a huge release of pressure. If the fuel system is closed,there must be some vapor recovery system. Could that be blocked/malfunctioning? What would cause/cure such high pressure in the fuel tank?

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