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Thread: 2001 duramax massive fuel leak

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  1. #1

    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?

  2. #2
    NutNbutGMC Guest

    Default

    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.

    .



  3. #3

    Default

    • SES light illuminated?
    • Any white smoke from exhaust lately?
    • Normal oil level?
    2011 Chevrolet Tahoe 5.3L daily driver
    • 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, '05 Denali
    • Total GM diesel miles to date : ~950K

  4. #4

    Default

    no SES
    no white smoke
    oil level normal and no hint of diesel smell in the oil

  5. #5
    Join Date
    Jan 2005
    Location
    Southern Indiana
    Posts
    1,177

    Default

    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.

  6. #6

    Default

    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.
    2011 Chevrolet Tahoe 5.3L daily driver
    • 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, '05 Denali
    • Total GM diesel miles to date : ~950K

  7. #7
    Join Date
    Mar 2007
    Location
    Pacific Northwest
    Posts
    740

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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.
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

  8. #8
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    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.
    Kennedy Diesel-owner
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