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Thread: Sticky on lift pumps

  1. #1
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    Default Sticky on lift pumps

    My fuel system took a crap on me last night. Finally got the truck running and it seemed to be running ok, then I developed a fuel leak back by the FMD, probably the rubber supply line hose but also I don't hear the LP running now.

    What I need to know is where is the harness so that you can check the lift pump? On the sticky it says you can check this at the DLC where would that be? Thanks.

    Mark
    1995 GMC C1500 4X2 6.5 N/A no mods yet

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    DLC = Diagnostic link connector
    Left from steering column, under the dash
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    Registered User buddy's Avatar
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    Its the OBD connector, and you can power your lift pump in a 1995 off of pin F, or you can see what voltage the lift pump is getting by measuring the voltage on pin F while the engine is running. When my OPS was failing and the lift pump trying to work, I would see the pressure go to vacuum and the voltage from the DLC went to like 7V which wasnt enough to run the LP.
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    Ok thanks guys I understand now ,that thought ran through my head before if it might be the diagnostic port. Well I might as well pull the intake and change the fuel hoses and do the FTB mod.

    Which is the best stock type LP to buy for like a stock hook up, Delco, Carter or spend the money on a Heath?

    Mark
    1995 GMC C1500 4X2 6.5 N/A no mods yet

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    All of them are hit or miss. Whichever you can get for the lowest price. For some reason at the parts store the one for 1993 costs less and does the same thing and was spec'd higher than 94 and 95.
    94 6.5TD C1500 ECLB w/ 50 gallon aux tank/box; 235/75R17 tires on Alloy wheels; 3.42 gears; A-Team Turbo; 4" Aero Turbine 4040 muffler to 5" Aero Turbine 5050XL muffler to 6" tip before rear axle; FSD heatsink, marine injectors; "F" intake; SynBlend 10W-30 oil; Walbro FRB-5 w/ 12 micron prefilter; Feed The Beast; WMI and Propane fumigation; OPS extension & relay; 110K original miles; Engh GMTDScanTech
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    Thanks Buddy I'll check that out, I eventually want to get a good pump with a pre-filter for it thanks again.

    Mark
    1995 GMC C1500 4X2 6.5 N/A no mods yet

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    Walking J Designs Veg_Out's Avatar
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    Remember, it could also be your oil pressure sensor that is supplying not enough voltage to the pump.

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    Quote Originally Posted by Veg_Out View Post
    Remember, it could also be your oil pressure sensor that is supplying not enough voltage to the pump.

    Thanks I'll check that out tomorrow now that I know where to check .

    Mark
    1995 GMC C1500 4X2 6.5 N/A no mods yet

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