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Thread: Fuel Filter System

  1. #1
    Join Date
    Jan 2003
    maui, hawaii

    Default Fuel Filter System

    I have install the lubrication fuel filter in a pre OEM setup for additional filtration. I have noticed that every couple of weeks the fuel system loses prime and I have to 'pump' the filter to get the truck started. Appreciate feedback on if this is a normal occurance or do I need to go looking for a pin hole leak. Visual inspection shows nothing. The fuel lines are soft, as expected, since I have no fuel lift pump. Is that the answer, do I need a fuel lift pump?

    Thanks in advance for any help.
    1) '03 GMC 2500HD Dmax/Ali Ext/Short 4x4; 4" exhaust, egt and boost gauges; exhaust brake; Bilsteins; BD exhaust manifold; Oil Guard bypass; Lubrication pre oem fuel filter; Tekonsha Prodigy; Mag-Hytec differential cover; Suncoast V transmission w/deep oil sump
    2) '07 Classic GMC 2500HD Dmax/Ali Ext/Short 4x4'; Bilsteins, Silastic shackles, BD exhaust manifold; Oil Guard bypass; Lubrication pre oem fuel filter; Tekonsha Prodigy; Federico sway bars; Dipricol boost and egt gauges; Transgo Jr,, Mag-Hytec differential and transmission pan

  2. #2
    Join Date
    Dec 2004
    RVing the USA


    Not normal.

    I plumbed my secondary fuel filter post OEM and have never lost the prime on it in 20K+ miles. It sounds like we have the same system from Greg Landuyt.

    I think I would suspect the large o-ring in the OEM filter, since that seems to be the weakest link in the system everytime I change filters. It has helped to remove the right fender well liner because the access is so much better. About a year ago I replaced the standard plastic anchors on the well liner with blind nuts (I guess that is what you call them - shaped like a squat "C" and they pinch over the sheet metal with a threaded nut on the side away from the liner) so now it takes about 5 minutes to pull the liner.

    With your filter pre-OEM, there is a chance it will load up much faster if you have much crud in your fuel - it is going to catch everything. With things post-OEM, I have found 10K to be a good interval for the OEM and 20K for the finer filter. Last change at those intervals both filters looked about equally loaded, but with room to spare for more junk.
    2003 K3500 Crew Cab, Banks Stinger Pkg, Exhaust Brake & Exhaust, OilGuard Bypass filter, Lube Specialist Secondary Fuel Filter, Allison Deep Pan, TTT Mirrors, B&W Turnover Ball and Companion Hitch, Truck Trunk Sliding Box and V-Box, LINE-X, Co-Pilot Live GPS, Hitchhiker 31.5 LKTG 5th Wheel 28' Wells-Cargo Gooseneck Car Hauler

  3. #3
    Join Date
    May 2005
    Central KY

    Default Same System

    I have the same system, but setup is post OEM for the same reasons as stated above. I'd also consider the fuel line connections.....mabe break and reestablish each one. Basically, uninstall/reinstall system. Good Luck.

    I've had mine on for about 5k miles with no indications of trouble.

    Jim M.
    '05 2500HD D/A CC SB 4x4 Silver LS ~65,000+ mi.
    Isspro EGT (pre-turbo) & Boost analog guages; 4" Magnaflow exhaust; Superchips programmer; Uni-Foam Air Filter; Boost stick w/ext.; Amsoil Lubrication products; Aux. fuel filter (Post OEM); FilterMags on oil, fuel, and trans; Bilstein shocks; Amsoil Dual Remote oil bypass; 60 gal. In-bed RDS Aux. fuel tank; Prodigy electric brake controller; VR3 Color Back-up Camera System, Battery tender
    '10 Coachmen FW 35RLDS ~35', 11k lbs.(loaded)

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