I removed all the emission crap off my car and one of the lines goes to the tank. I capped it off not knowing what it was and the tank would build pressure from the heat of the drivetrain while driving. I noticed the large purge of pressure when at the gas station so I went back and uncapped the line. Waalaa. No more pressure problem. If your car still has the charcoal canister the line must be plugged up between there and the tank. Pull off the small black line and blow it out with the cap off the tank or run the the line out to the tank and disconnect both ends and blow out.
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