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Old 08-31-2018, 12:55 PM
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Gas puddle under full gas tank - 2007 JKU

Had this JKU now for 3 weeks, traded my 07 JK to an 07 JKU with less miles.

First fill up I got gas splash back from the fuel port, searched this forum and discovered the Wrangler tech bulletins for this problem. The bulletins did not mention leaking gas under the tank on the passenger door. Also gas fumes are horrendous until the tank level is down to 1/2 tank.

The dealer dropped my tank yesterday and found nothing. We could see evidence of where gas had been on the different plastic lines on top of the tank. Dealer pressurized the tank to 20 psi and there were no leaks anywhere. No cracks in any of the plastic.

I made an appointment for the gas filler warranty replacement with the local Jeep dealer for Oct. 1 and hope that for reasons unknown to me this will solve my leak and fumes problem.

I'm looking for ideas as to why I would have a tiny (maybe 1 ounce) puddle under the gas tank. The day was hot, mid 90's and there is a very small incline in my driveway to allow water to run back to the street. Gas fumes were more prevalent around the right rear of the vehicle. Prior to this episode the dealer had replaced a valve on the EVAP canister due to a check engine light.

Ideas?

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Old 08-31-2018, 01:05 PM   #2
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Originally Posted by Nick M. View Post
Had this JKU now for 3 weeks, traded my 07 JK to an 07 JKU with less miles.

First fill up I got gas splash back from the fuel port, searched this forum and discovered the Wrangler tech bulletins for this problem. The bulletins did not mention leaking gas under the tank on the passenger door. Also gas fumes are horrendous until the tank level is down to 1/2 tank.

The dealer dropped my tank yesterday and found nothing. We could see evidence of where gas had been on the different plastic lines on top of the tank. Dealer pressurized the tank to 20 psi and there were no leaks anywhere. No cracks in any of the plastic.

I made an appointment for the gas filler warranty replacement with the local Jeep dealer for Oct. 1 and hope that for reasons unknown to me this will solve my leak and fumes problem.

I'm looking for ideas as to why I would have a tiny (maybe 1 ounce) puddle under the gas tank. The day was hot, mid 90's and there is a very small incline in my driveway to allow water to run back to the street. Gas fumes were more prevalent around the right rear of the vehicle. Prior to this episode the dealer had replaced a valve on the EVAP canister due to a check engine light.

Ideas?
Does the dealer have a gas pump onsite, or could you bring some gas tanks for them to fill up if they dont and then diagnose as they are filling the tank back up? Sounds like the most reasonable thing to do.

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Old 08-31-2018, 06:30 PM   #3
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The main cause of this type of problem is that when the tank is full, gas leaks through the seal between the tank, lock ring and the fuel pump. When the fuel level goes down there will be a gas odor that appears to be coming from the right side rear wheel well. The seal goes bad after awhile and the lock ring corrodes. In order to repair it the tank has to be dropped. The seal and lock ring are available. As long as the tank isn't cracked the parts are approx. $35.00.
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Old 08-31-2018, 07:46 PM
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The main cause of this type of problem is that when the tank is full, gas leaks through the seal between the tank, lock ring and the fuel pump. When the fuel level goes down there will be a gas odor that appears to be coming from the right side rear wheel well. The seal goes bad after awhile and the lock ring corrodes. In order to repair it the tank has to be dropped. The seal and lock ring are available. As long as the tank isn't cracked the parts are approx. $35.00.
This sounds exactly like my problem but if the seal is bad how is it that the tank can hold pressure at 20psi? Dealer did this for several minutes and there was no leak down, held firm at 20psi. Tank isn't cracked, no cracked hoses or fittings. I looked very closely at all of the fittings when the dealer dropped the tank and pressurized it.
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Old 08-31-2018, 09:00 PM   #5
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This sounds exactly like my problem but if the seal is bad how is it that the tank can hold pressure at 20psi? Dealer did this for several minutes and there was no leak down, held firm at 20psi. Tank isn't cracked, no cracked hoses or fittings. I looked very closely at all of the fittings when the dealer dropped the tank and pressurized it.
I don't know why it might have been holding pressure, but when there's an obvious fuel leak on the ground and also a fuel odor when the level in the tank drops, it has to be leaking from someplace. If there's no leak from the lines and the tank isn't cracked then the primary place to rule out is the fuel pump seal. When the tank is full there might be enough pressure for it to leak. If it is coming from there then that area will be wet. Good luck.
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Old 09-01-2018, 08:24 AM
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I don't know why it might have been holding pressure, but when there's an obvious fuel leak on the ground and also a fuel odor when the level in the tank drops, it has to be leaking from someplace. If there's no leak from the lines and the tank isn't cracked then the primary place to rule out is the fuel pump seal. When the tank is full there might be enough pressure for it to leak. If it is coming from there then that area will be wet. Good luck.
That's where we are at, no apparent location for the leak but we know it does leak. With less than 1/4 tank I put 10 gals. in the tank and drove it home. Both my wife and I could detect gas odor around the right rear wheel but it didn't seem as strong as when the tank is full.

After the TSB filler tube replacement on 10/1 I plan to fill it up and see if the problem remains. I can't imagine a replacement filler tube resolving my problem but I have my fingers crossed.

@trailhunter - I believe the dealer has a pump on site but I doubt they would fill it up just to see that my story is real. They seem to believe me and spent nearly 8 hours of shop labor to drop, pressure test and reinstall the tank.
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Old 09-01-2018, 08:25 AM   #7
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That's where we are at, no apparent location for the leak but we know it does leak. With less than 1/4 tank I put 10 gals. in the tank and drove it home. Both my wife and I could detect gas odor around the right rear wheel but it didn't seem as strong as when the tank is full.

After the TSB filler tube replacement on 10/1 I plan to fill it up and see if the problem remains. I can't imagine a replacement filler tube resolving my problem but I have my fingers crossed.

@trailhunter - I believe the dealer has a pump on site but I doubt they would fill it up just to see that my story is real. They seem to believe me and spent nearly 8 hours of shop labor to drop, pressure test and reinstall the tank.
Just mention your willing to pay the price for the gas.

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