Gas Cap Pressure
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Freshman User
Joined: Mar 2003
Posts: 25
Likes: 0
From: Eastern MT
Gas Cap Pressure
I have a strange question....is it normal to have a huge pressure build up in the gas tank that literally blows the gas cap out of your hand when you unscrew it? I have a 1983 Bronco with a Inline 6 Manual Transmission. For the last couple of months everytime I open the gas cap a huge build up of pressure comes out. It doesn't matter wheter I have driven it or if it has just been sitting...it still blows the cap off. None of my other vehicles do that. (Occasionally a small amount of pressure is released, but nothing like I am experiencing on the Bronco!) Just wondering if anyones has any ideas of what is wrong, or if this is just a natural occurence. Thanks for your help!
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Gas Cap Pressure
Either the rollover valve in the top of the tank is locked up, or the vapor line that runs from it along the R frame rail to the carbon canister is plugged. Look at these pics.
