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Fuel system won't prime

Discussion in '04.5-05 LLY' started by red, Dec 9, 2014.

  1. red

    red stubborn Texan displaced to Utah

    1,439
    46
    May 17, 2008
    Eagle Mountain, Utah
    Changed the fuel filter on the duramax last weekend and can't get the fuel system to stay primed.

    Last time I changed the filter I removed the air bleed screw, turned the ignition on to cycle the lift pump and after a few seconds all is well. Tried that this time with no luck.

    Tried pumping the little pump on the top of the filter mount for 10 minutes, no joy.

    Little bit of air pressure to the fuel tank and a few minutes later the fuel starts flowing to the filter. Fire the truck up and run out of fuel within a few seconds.

    Thinking a dead lift pump, or am I missing something?
     
  2. gmctrucksrock

    gmctrucksrock gmctrucksrock

    131
    25
    Dec 15, 2011
    Anchor Point, Alaska
    To my knowledge duramax doesn't have lift pump it's all in the injection pump, if it ran before filter change I'd go back to that remove try again did you miss something gasket?
     
  3. THEFERMANATOR

    THEFERMANATOR FRANKENBURBAN Staff Member Lead Moderator

    8,409
    1,500
    May 9, 2008
    ZEPHYRHILLS FL
    Yep, what lift pump is on the truck? The ONLY DURAMAX to come with a factory lift pump was vans. ALL trucks did not, and still do not have one(cab and chassis's do have a transfer pump to move fuel from the rear tank to the front, but that's it). And also, you didn't put one of them plastic fuel filters on it did you?
     
  4. btfarm

    btfarm 300,000 Worth Staff Member Moderator

    15,994
    1,266
    May 12, 2008
    Sandwich, Illinois
    It can be tricky to get the o-ring to seat all around the filter. The manual primer could need a rebuild too.
     
    WarWagon likes this.
  5. red

    red stubborn Texan displaced to Utah

    1,439
    46
    May 17, 2008
    Eagle Mountain, Utah
    Swapped to a nicktane filter adapter and used a CAT filter, not a cheapo filter.

    I'll remove the filter again when I get home and check it out. Could have sworn last time I turned the ignition and the system primed, might be thinking of the deuce and a half though lol.

    I thought all the diesels had lift pumps?
     
  6. WarWagon

    WarWagon Well it hits on 7 of 8...

    7,271
    1,250
    Nov 15, 2009
    AZ
    No that one doesn't have a lift pump. The filter heads were known to crack and as I recall the primer was iffy at best on that specific truck. After checking the filter seals I suggest you order new seals for or replace the primer. I replaced the primer o rings once (aftermarket makes the O-Rings, GM doesn't) already so if you are in a hurry I suggest replacing the entire primer assy - not sold separately that I ever found. A lift pump added with an air leak can turn into a fuel leak.

    I did return a plastic Wix fuel filter after it sucked air at the WIF sensor and nearly stranded me.
     
  7. red

    red stubborn Texan displaced to Utah

    1,439
    46
    May 17, 2008
    Eagle Mountain, Utah
    I used new seals with the adapter.

    If the stock base/primer is iffy at best, anything wrong with upgrading to a lift pump and a better filter base? Want to run a 2 stage filter setup anyways
     
  8. red

    red stubborn Texan displaced to Utah

    1,439
    46
    May 17, 2008
    Eagle Mountain, Utah
    Well, discovered the problem. Pulled the filter and adapter off to compare them. Good seals. On the old filter there is a cross piece in the suction side of the filter, pushes the ball valve open to allow fuel to flow from the filter to the pump. My adapter has nothing there to open the ball valve.

    [​IMG]
     
  9. WarWagon

    WarWagon Well it hits on 7 of 8...

    7,271
    1,250
    Nov 15, 2009
    AZ
    Glad you found the problem.

    That valve prevents fuel from dripping all over everything from the line going to the CP3. Fuel flows from the outer holes to the center of the filter. the entire filter is on the suction side but the center is the clean side going to the CP3. The check valves in the primer prevent fuel from going back to the tank.

    The filter head has a fuel heater in it. Other than that you can replace it completely with something better.
     
  10. THEFERMANATOR

    THEFERMANATOR FRANKENBURBAN Staff Member Lead Moderator

    8,409
    1,500
    May 9, 2008
    ZEPHYRHILLS FL
    That check ball is opened via vacuum when the engine is running. Nothing is meant to push it open. Also it says in the nicktane directions to remove the check ball when you install the nicktane adapter, so it shouldn't be in there with the adapter anyways.
     
  11. red

    red stubborn Texan displaced to Utah

    1,439
    46
    May 17, 2008
    Eagle Mountain, Utah
    Missed that part (bought the adapter awhile ago), will be pulling the ball this weekend.
     
  12. red

    red stubborn Texan displaced to Utah

    1,439
    46
    May 17, 2008
    Eagle Mountain, Utah
    All set, no issues now. Contemplating upgrades now haha
     
  13. btfarm

    btfarm 300,000 Worth Staff Member Moderator

    15,994
    1,266
    May 12, 2008
    Sandwich, Illinois
    Good deal. Just so you know. .. I'm still running the standard fuel system setup. I do have a set of shims to install in the FPR but haven't gotten to it. Truck still runs excellent as currently set up
     
    red and Ed HD like this.
  14. Ed HD

    Ed HD Formerly: Dad's 05 LLY

    3,087
    252
    Jul 6, 2008
    Lakeville, Minnesota
    ^^^^

    I get the Racor (OEM) filters from Greg (Lubrication Specialist) and replace them yearly, right around the 15k mark. I had no issues with the Wix plastic filters, but after hearing issues with them, I'll stick to the OEM. I just replaced what appeared to be the OEM (120k miles) fuel filter on the 08 GMC C4500 we bought this spring, so I'm glad I try to keep up on maintenance. That was kind of a PITA to replace...
     
  15. red

    red stubborn Texan displaced to Utah

    1,439
    46
    May 17, 2008
    Eagle Mountain, Utah
    I run CAT filters on both my trucks, makes it easier for me.

    The truck runs great with the tune, little more smoke at wot than I want. Planning on an exhaust upgrade next.
     

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