Results 1 to 7 of 7

Thread: 04 GMC loseing prime

  1. #1

    Default 04 GMC loseing prime

    this just started about 2 weeks ago. Started it up took off and it died. I tried to start it and it would not start. sounded like it wasnt getting any fuel, so poped the hood and pumed up the filter and it started up . dorve it for a week and it did it again .sat morning and again this morning . any ideas

  2. #2
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    2 words:

    Lift Pump
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
    Superflow Lie Detector in house
    2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
    2005 Chev K3500SRW D/A CC Long LT(SOLD)
    2007 Chev K2500 Classic EC Short LT (Sold)
    2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
    2016 GMC K3500SRW D/A CC short LTZ

    Custom tuning in house using EFI Live tuning software!

  3. #3
    Join Date
    Dec 2002
    Location
    Teton Valley, Idaho
    Posts
    1,873

    Default

    While a lift pump would almost certainly work around the problem, would it actually SOLVE the problem of an apparent leak in the fuel system? Or would one begin to see fuel coming from said leak, thus making it easier to repair and end up being ahead of the game in having a lift pump ease the stress on the HPFP?

  4. #4
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    Quote Originally Posted by rapidoxidationman View Post
    While a lift pump would almost certainly work around the problem, would it actually SOLVE the problem of an apparent leak in the fuel system? Or would one begin to see fuel coming from said leak, thus making it easier to repair and end up being ahead of the game in having a lift pump ease the stress on the HPFP?
    Without a doubt.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  5. #5
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    By following my advice you will be giving your Dmax something it really should have rather than chasing your tail.

    Every Dmax should have a lift pump. By not putting a lift pump on you are doing the fuel system a great disservice in letting the system process excessive amounts of air. Placing the system under pressure will almost certainly cure the issue at hand, AND if there is a leak of sufficient size it will show itself. In most cases there is not sufficient leakage to even weep fuel. It simply lets air in and can be one heck of a time and money waster trying to track down.


    http://www.kennedydiesel.com/docs/Du...20Failures.pdf


    Of course you could go see the dealer and be told that the fuel filter housing is "cracked" and needs to be replaced... $$$
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
    Superflow Lie Detector in house
    2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
    2005 Chev K3500SRW D/A CC Long LT(SOLD)
    2007 Chev K2500 Classic EC Short LT (Sold)
    2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
    2016 GMC K3500SRW D/A CC short LTZ

    Custom tuning in house using EFI Live tuning software!

  6. #6
    Join Date
    Jun 2010
    Location
    Texas
    Posts
    20

    Default

    I had same problem and low and behold it was that little bleeder screw on the fuel filter housing. for some reason its made of plastic and it was striped and letting in air. i ordered an aluminum one from MA, fixed it.
    2004 chevy dmax lly, afe 4 in exhuast, Autometer Ultra Lite II OH Gauges, DSP5 from Duramaxtuner.com stock trans tunes

  7. #7
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    The plastic bleeder screws while cheap really are not that bad. The problem is when guys use tools on them. If you only finger tighten them they'll last forever and they seal well before they seat.

    For this reason we made our aluminum bleeder as a thumb know with a knurled/striped outer rim that stands much taller than the OE nut flange. I did add a nice deep screw slot for good measures. I also anodized it red for easy location for newbies. You never know when your truck will be out on loan and you have to talk someone through a basic prime operation.

    I still say that a lift pump is necessary though...
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
    Superflow Lie Detector in house
    2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
    2005 Chev K3500SRW D/A CC Long LT(SOLD)
    2007 Chev K2500 Classic EC Short LT (Sold)
    2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
    2016 GMC K3500SRW D/A CC short LTZ

    Custom tuning in house using EFI Live tuning software!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •