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Old 08-25-2015, 06:55 PM
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Gas tank leaks only after engine runs...

OK, I am a dumbass musician who doesn't know crap about mechanical stuff.... shocking... I know. I first thought my tailpipe busted a hole in my tank because it was leaking by the tailpipe which is regularly smacking against the skid plates surrounding the gas tank..... now I realize that it leaks only while the engine is running and shortly after I shut it off. Not when it is sitting still. Also I have had issues with it not wanting to start right up since this issue arose yesterday. Before that it cranked right up each and every time. Does it sound like I have a fuel line issue? Any help greatly appreciated. I will repay with any guitar/bass related questions you might have.

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Old 08-25-2015, 07:02 PM   #2
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I am going to say YES it's coming from the top side of fuel pump or in the gas line, like stated in your previous post about this issue in another thread you need to just drop the gas tank and figure out where it's coming from or get it to a mechanic before you blow your jeep up!!!! I don't mean to be harsh but this is your second thread about the same subject and you have yet to heed the advise given.

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Old 08-25-2015, 07:06 PM   #3
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I would say that it sounds like the vent lines are off on the top of the tank.

When its running, the fuel pump pushes more gas than the motor can use and the rest returns to the tank via the return line. The fuel system is pressurized and the vent line relieves this pressure via a line that normally comes forward to a charcoal canister. That way the canister catches all the fumes and you don't get the gas smell.

Sounds like the vent line has come off and you are getting gas residue and odor as long as the motor is running, and shortly after shutting it down. Then when the pressure subsides there is no more drip. This is also causing the hard start because the system is losing its prime.

Fix the vent lines and cure the problem.
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Old 08-25-2015, 07:24 PM
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I'm not ignoring advice. I realized I was wrong about my initial statement and sounded dumb so I started a new thread with more accurate information.

I have no idea how to drop a gas tank not to mention being able to diagnose the problem. I came here to get advise and learn.

It's going to the shop tomorrow but would like to be informed and be able to give them an intelligent description of what's going on.
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Old 08-25-2015, 07:26 PM
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Thank you 0lll0forlife. I appreciate that input. I have been having problems with that vent when I fill the tank. I suspect the issues are related and need to be fixed asap.
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Old 08-25-2015, 07:49 PM   #6
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Unfortunately all yj's have the fill up problem, it's the tight angle they used by putting it behind the license, something they fixed with the tj's by putting them on the side. I doubt that's your problem but I hope you get it fixed nun the less. GL
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Old 08-25-2015, 08:01 PM
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Well I am gonna take it in tomorrow. Not gonna play around with fuel leaks. My wife's YJ will leak if we fill it up to much but mine prob has less then half a tank at the moment. You may be right.....

Thanks for all the input.
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Old 08-25-2015, 09:50 PM   #8
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Mine dumped ten gals of gas in three miles. PO had replaced the fuel pump module and left the original fuel lines. It had ruptured the return line above the tank. Would start and run fine. Dropped the tank and replaced all of the hoses- problem solved.
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Old 08-29-2015, 06:34 AM
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Well mine was the same issue so they replaced the fuel lines while they were putting in a new exhaust system. $348 later and the Jeep is back in action. Sounds great and no leaking....

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