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Whooshing sound when removing gas cap

Fuel System

Model: Carrera, Year:1984, Mileage:75000, Type of use:Street use only
I have a 84 3.2 Carrera that always has a loud whooshing sound when I remove the gas cap. I have not been able to determine if there is a vacuum or pressure in the tank that is being released. The car runs fine and I have been told "don't fix it if it ain't broke". Is there a problem or is this normal? The only other symptom I have is the fuel gauge only reads ½ full when I fill up. Once the tank gets down to ½ full, the gauge starts reading normally.

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