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My 85 coupe's gas tank will hiss and vent when i loosen the cap for refueling for a good 30 to 45 seconds. I know its very explosive at that time. What the hell is causing the pressure to build up so much in the tank???. Worse on very hot days. :WTF :WTF

ABOUT TO GO BOOM IN BOSTON,,,, Thanks JS
 

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It's normal to develop some pressure in a closed fuel system (especially when it's hot out.) If you think it's excessive, check your return system and evap can purge valve.
 
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