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I have a ? After driving for a while my fuel tank build pressure. I can hear it coming out of the relief valve and when I take the fuel cap off I get a wush sound like there was alot of pressure behind it. I dont remember this happening before. Is this normal or is there something wrong. thanks
 

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Are you sure it's pressure and not vacuum? Sometimes it hard to tell if you are just going by the sound. Could be your vents on top of the tank are plugged.

Next time before removing the cap, crawl under the truck and you might be able to tell if the tank is bulging or sucked in a little bit.

Randy
 
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