Gas tank issue - JeepForum.com
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post #1 of 11 Old 08-23-2019, 08:29 PM Thread Starter
stevewolfson
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Gas tank issue

Just picked up an 06 LJ with a 6 speed. When filling up the automatic shut off does not shut off and gas come spilling out. Is this a common issue and does anyone know the fix? thx

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post #2 of 11 Old 08-23-2019, 08:56 PM
ravenworks
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There is a huge thread about this problem

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post #3 of 11 Old 08-23-2019, 10:28 PM
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post #4 of 11 Old 08-23-2019, 10:46 PM
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post #5 of 11 Old 08-24-2019, 01:56 AM
AjRagno
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I installed the GM hose a few years ago and it does work just fine to address the overflow issue. I figure I'll modify the back splash valve when it's time to replace the fuel pump.

While you're getting oriented with the quirks of an '06 TJ, make sure you also have a Crown OPDA, or that you are at least aware of the OPDA failure signs.
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post #6 of 11 Old 08-24-2019, 05:56 PM
TooManyIrons
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Quote:
Originally Posted by AjRagno View Post
I installed the GM hose a few years ago and it does work just fine to address the overflow issue. I figure I'll modify the back splash valve when it's time to replace the fuel pump.

While you're getting oriented with the quirks of an '06 TJ, make sure you also have a Crown OPDA, or that you are at least aware of the OPDA failure signs.

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post #7 of 11 Old 08-25-2019, 08:13 AM
RDBills
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The issue is caused by a sticking anti-rollover valve in the fuel tank. It manifests as either (1) fuel spit back when fueling caused by the valve being stuck open, (2) the gas pump continually clicking off because the valve is stuck closed or nearly closed resulting in it taking forever to fill the tank, or (3) both depending on where the valve is stuck on a particular day.

The GM filler hose hack referenced above is a band-aid that addresses symptom #1 only, it is not a fix for the root cause.

The fix is to drop the tank, remove the anti-rollover valve and sand down the nubs on the plastic plunger a bit until it moves freely, then reinstall. No new parts are necessary and the repair is free if you DIY.





Similar post in a related thread: https://www.jeepforum.com/forum/f9/0...l#post40719735
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post #8 of 11 Old 08-25-2019, 03:40 PM
Kalten
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Quote:
Originally Posted by RDBills View Post
The issue is caused by a sticking anti-rollover valve in the fuel tank. It manifests as either (1) fuel spit back when fueling caused by the valve being stuck open, (2) the gas pump continually clicking off because the valve is stuck closed or nearly closed resulting in it taking forever to fill the tank, or (3) both depending on where the valve is stuck on a particular day.

The GM filler hose hack referenced above is a band-aid that addresses symptom #1 only, it is not a fix for the root cause.

The fix is to drop the tank, remove the anti-rollover valve and sand down the nubs on the plastic plunger a bit until it moves freely, then reinstall. No new parts are necessary and the repair is free if you DIY.



Similar post in a related thread: https://www.jeepforum.com/forum/f9/0...l#post40719735
Itís a simple fix and can be done in an hour. If you have or know someone with a motorcycle jack it is even easier.

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post #9 of 11 Old 08-30-2019, 02:27 PM
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Quote:
Originally Posted by RDBills View Post
The issue is caused by a sticking anti-rollover valve in the fuel tank. It manifests as either (1) fuel spit back when fueling caused by the valve being stuck open, (2) the gas pump continually clicking off because the valve is stuck closed or nearly closed resulting in it taking forever to fill the tank, or (3) both depending on where the valve is stuck on a particular day.

The GM filler hose hack referenced above is a band-aid that addresses symptom #1 only, it is not a fix for the root cause.

The fix is to drop the tank, remove the anti-rollover valve and sand down the nubs on the plastic plunger a bit until it moves freely, then reinstall. No new parts are necessary and the repair is free if you DIY.

https://youtu.be/V4DXHsacHB4


https://youtu.be/x83vjIclEyk


Similar post in a related thread: https://www.jeepforum.com/forum/f9/0...l#post40719735
Dropping the tank is the ultimate fix, but if a band-aid lasts forever there isn't anything wrong with it.
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post #10 of 11 Old 08-31-2019, 10:03 AM
RDBills
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Except that in this case the "band aid" only covers up one of the symptoms and does nothing to address the slow fill issue that has an equal chance of occurring with a stuck overflow valve.

Its like a tire shop telling a customer, "We found two potential problems with your tire so we put a temporary patch on one of them."

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post #11 of 11 Old 08-31-2019, 10:17 AM
biffgnar
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Quote:
Originally Posted by RDBills View Post
Except that in this case the "band aid" only covers up one of the symptoms and does nothing to address the slow fill issue that has an equal chance of occurring with a stuck overflow valve.
Maybe in theory they have equal chance of occurring but over the last 10 years here the stuck open (and overflow) is much more common by multiples.
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