Quote:
Originally Posted by novadude
My old '70 Nova did the exact same thing with the OEM tank and cap, and I never did figure out why. The tank had no apparent issues with venting, and it didn't cause any performance issues, or tank damage, so I just lived with the "whoosh".
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As I stated earlier, the original tank did not do that but it also had a leak around the filler neck next to the tank, Maybe the leak did vent it better. I just took the car for a ride to get gas and it performed well and it did "Whoosh" when I opened the cap.