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1985 camaro - after a long time, the fuel pump failed. Car towed and they replaced the fuel pump. I drive 2 miles to the gas station and remove the cap - excessive pressure is exiting the gas tank. I'm in Florida - I know it's hot here, but I've had this baby 31 years and never did this. The pressure will eventually go away after several hours of sitting in the garage, but what's causing the pressure build up? Did something happen when they dropped the tank? or when the fuel pump went bad? (1985 v6 2.8 base camaro).
 

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There is a one way valve type vent that is mounted on the Driver side frame rail not far from the inline fuel filter. It is possible that it is plugged up or bad. It is right out in the open and I had mine get stuck full of junk and wouldnt allow it to open. I cleaned mine out and actually just blew in to it and I could here and feel air coming out after I cleaned it. Solved my same issue. Hopefully it will for you too!
 
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