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Can anyone tell me why I constantly have a lot of pressure in my gas tank? I thought that I should have a little bit but not to the point when I open my gas cap that I have to wait for the pressure to release (30-60 seconds). on top of that I can smell gas when I walk around the truck after I drive a short distance.
 

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Again, year and engine would help someone talk specifics.

Unless it's more than 15-20 years old, it should have an EVAPorative emissions system that vents excess tank pressure to the intake. The symptoms you describe can be caused by a fault in the EVAP system.
 
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