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post #1 of (permalink) Old 10-13-2007, 02:28 PM Thread Starter
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Fuel leak?

I was showing my son the engine and noted a dried up puddle on the manifold.

Is this a fuel leak and has any one else have this on their JK?

Stupid question
Safe enough to drive it to the dealer?

It's a 2008 with about 700 miles on it.

Also sould this be here?

THere are none on the other side but there is no paint under it.
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post #2 of (permalink) Old 10-13-2007, 02:35 PM
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If there is no gas puddled there at the moment, I would open the hood and start the jeep, then look and see if I could see where its coming from and how quickly. If its only an occassional drop, I'd drive it straight to the dealer.
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post #3 of (permalink) Old 10-13-2007, 05:39 PM
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Am I seeing what I think I am? Is that your fuel-rail that looks To be Brazed??? Man, I hope that's not the case. Wow, I swear quality is no more. Either way, check the injectors, rail etc... especially around the brazed joints... If too much heat has been applied it might have pushed or pulled the material away leaving a slight pin leak or the heat/cold changes matched to the vibration may have cracked a thin braze etc...
Do what TiminMb said and check for the leak while running... If it's a drop here and there either drive it over to the stealership or have the Stealership come and pick it up on a flatbed and bring it to their shop on their own dime! Make them fix their own cheap design... Personally when it comes to fuel I don't play around... whether it's 87 octane or 105+ Octane... If it's not Welded (Tig) or joined together with the proper AN fittings I won't ride in it. MURPHY's LAW is constantly looking for another opportunity.

Last edited by [email protected]; 10-13-2007 at 05:53 PM.
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post #4 of (permalink) Old 10-13-2007, 06:08 PM
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My question is...

If the puddle has dried up, how do you know the stain was left from fuel residue?

If it wasn't fuel residue, the what was it? Is there a smell of fuel?

I agree, start the engine an look to see what's happening.

You may even start the engine and quickly shut it off and see if the rail holds pressure.

If there's no leak, walk away for a while. Monitor the area by putting some tissue there (remember you didn't start the engine and get it hot...) Come back every once in a while to see if the tissue has a fuel smell. If not put it back. Then when you're ready to conclude your test, check tissue one last tiem for a hint/smell of fuel. If there's not a hint of fuel, then press the schrader valve to see if rail is still holding pressure. If there is pressure and no fuel smell on the tissue, then likely there's no leak and your seeing evidence of something else.
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post #5 of (permalink) Old 10-13-2007, 07:51 PM
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On my CJ7, I had fuel leak right on the manifold, I found it because I was talking to a friend and heard the "sizzle" from the motor. The good news is that the autoignition temperature of Gasoline is about 495F.

I would think twice about driving it. While the autoignition temperature is real high, a low temperature spark can ignite it. I would call a dealer and ask them if they would tow it under warranty.

-- Mike
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post #6 of (permalink) Old 10-13-2007, 09:13 PM
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The top two pictures look like it could be causolene. (not sure how to spell it) Had that happen on my 05 Dodge. I took it in to the dealer thinking it was an oil leak.

1978 CJ5, AMC 401, CJ T18, Scout D300, 2 1/2" Lift, Locked Front/Back
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post #7 of (permalink) Old 10-13-2007, 10:23 PM
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Originally Posted by John_Strenk View Post
Also sould this be here?

THere are none on the other side but there is no paint under it.
"Now where did I leave that dang build sheet?! The boss will kill me if I can't find it!"

Caver Dave
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the Trail Forge
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