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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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  #1  
Old 03-01-2009, 11:36 AM
Deerhunter Deerhunter is offline
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Default 2001 duramax massive fuel leak

I'm new to the forum guys, so be gentle. I have a 2001 GMC Sierra 2500HD Duramax. Its been running great. It has 72K miles on it. The other day it started rather hard and I smelled fuel. I looked under the truck and noticed a rather huge flow of fuel coming down from around the bellhousing. I shut it off and the leak stopped after a few minutes. When I started it again it started leaking again. I cant see where its coming from. Nothing visible from the top and I cant see where it originates from the bottom. Does the fuel line and return line go over the back of the engine?
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Old 03-01-2009, 12:29 PM
NutNbutGMC
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You may consider doing a serach here on injectors or scan the board.

In short, that being an LB7 engine, I suspect injectors. The less you spread fuel, the less damage it does to the coatings and wiring harnesses. I had to (also) have the entire wiring harness system replaced. It was saturated as diesel will dissolve most anything.

You can do a search on my screen name and find a few testimonies of my experiences.

Sorry about the problem. I think your warranty should cover this unless the timeframe of warranty has lapsed. I may be completely wrong about this issue that you have described but similar symptons that have been written about here have turned out to be said suspected problem.

Here's a pic of an enroute fuel dump that I experienced.

.


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  #3  
Old 03-01-2009, 01:07 PM
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Mark Rinker Mark Rinker is offline
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  • SES light illuminated?
  • Any white smoke from exhaust lately?
  • Normal oil level?
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  • Total GM diesel miles to date : ~950K
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Old 03-01-2009, 02:48 PM
Deerhunter Deerhunter is offline
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no SES
no white smoke
oil level normal and no hint of diesel smell in the oil
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Old 03-01-2009, 03:13 PM
madmatt madmatt is offline
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I've seen cracked rails and fuel rail pressure sensors both cause external fuel leaks but without taking some stuff off, it's hard to tell where it's coming from.
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Old 03-01-2009, 04:49 PM
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Mark Rinker Mark Rinker is offline
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If it were mine, I'd tow it to the nearest dealership - while diesel isn't terribly volatile - I wouldn't risk starting it again with this much raw fuel present...

Sure sounds like one of the problems suggested by Madmatt.
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2005 GMC Yukon Denali 6.0L gas (hey its paid for)
  • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW
  • Total GM diesel miles to date : ~950K
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Old 03-01-2009, 06:30 PM
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Duramaster Duramaster is offline
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Sounds to me like the pump itself is leaking. If it still runs, start the engine and look in the valley of the engine in the pump area. See if you see fuel leaking there. I have also seen the high pressure line leak where the fuel exits the pump and heads towards the left fuel rail. Good luck.
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  #8  
Old 03-01-2009, 06:45 PM
Kennedy Kennedy is offline
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Anybody remember the fuel pressure sensor leaks? Not really super common, and it might be a bit odd that it waited this long to show, but more common than external pump leaks. This issue was oftenbrought to the surface by the addition of psi boxes, but basically it was not tight enough and would suddenly leak/drip as you describe.

Worth a look. Usually you can do a visual check for the drip on this one.
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Old 03-02-2009, 07:01 AM
Deerhunter Deerhunter is offline
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Thanks for all the help guys. I am gonna have it towed in to a repair shop when I come up with some money. (its tight these days)
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  #10  
Old 03-02-2009, 04:48 PM
madmatt madmatt is offline
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If you can verify if it's the FRP sensor,, I'm PRETTY sure I have one laying in the garage.
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