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Old 07-27-2008, 10:04 AM   #1
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Fuel system over pressurizing

I have a 1991 YJ that is having a serious problem with the fuel system over pressurizing. I have not put a guage on it to see what the actual pressure is but when I remove the filler cap the pressure inside the tank will almost blow the cap out of my hand. The Jeep runs great which is part of the reason I'm confused by this. Does anyone have any suggestions as to what may be causing this?

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Old 07-27-2008, 03:40 PM   #2
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I think that you'll find your fuel pressure is just fine and that your problem is in the vent line off the top of your tank. There should be a line that comes off the top of the tank and goes to the carbon canister under the hood. Something is plugged in there somewhere. Disconnect the line at both ends (the canister and the tank) and see if you can get compressed air through the line.

Or try getting a vented gas tank cap.
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