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Thread: She quit running

  1. #1
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    Default She quit running

    Well after running beautifully for me for almost a year, she quit running suddenly like it ran out of fuel. I ran and got 10 gallons and poured it in. No dice. Cracked an inj line, no fuel on cranking. I've been meaning to put a new lift pump in it for piece of mind, so i did. No dice. I think the last one was shot because the new one is alot noisier. I got it to fire and run well for 5-10 seconds on a small shot of starting fluid. (bad I know). Still no fuel coming out when i crack a line, bt it does flow out of the filter thingy. I installed a Heath kit when I bought it (chip, tm, new pmd in the bumper). Obviously the inj pump isn't pumping, but I'm not sure where to look next. Any help is much appreciated, I'm off to cruise for some more info.....Jason in CT
    1994 3500HD 6.5 10' flatbed dump dually, 15kgvw. 5spd, 150k. Heath pmd, heath tm, heath chip.

  2. #2
    I welcome everyone...not just Penguins! DEERE3594's Avatar
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    Default

    This is hurting my head thinking about it and not sure what to say..
    How old is your IP? Was iit running good before hand?
    -Justin
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    Registered User NVW's Avatar
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    Default

    Sounds like you have fuel to the IP but not to the injectors. Check the fuel shut off sol. fuse as well as the ECM fuse to rule those out. Check the grounds as well. I would also check the ext. to the FSD. Does the fuel sol. click when the ign. is turned on? Leo
    Leo
    * 95 GMC 3500 4x4 dually, VIN "F", 4.10 gears, 4L80/E trans, 405,000km, 3" downpipe, 4" exhaust, FSD mounted on heat sink in bumper, #9 resistor, 3 pillar gauge's, High Idle kit, Bosch marine injectors, Bosch Duraterm glow plugs, Leroy's ATT chip, ATT, GP overide, K47 airbox, FTB, Racor fuel filter, fuel pressure gauge
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  4. #4
    Recruit JMJNet's Avatar
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    Have you checked your OPS? I know it is new LP.
    #####---------######-------#####
    1995 6.5TD GMC Suburban
    PMD in Bumper
    4" Warpspeed Exhaust
    KD LP/OPS Harness
    Bosch Duraterm GP
    Heath Turbo-Master
    Chevron's XLP Diesel Additive

  5. #5
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    I'll check fuses today. How do I check the function of the OPS. (not sure where its located either)?
    1994 3500HD 6.5 10' flatbed dump dually, 15kgvw. 5spd, 150k. Heath pmd, heath tm, heath chip.

  6. #6
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    Default

    Quote Originally Posted by DEERE3594 View Post
    This is hurting my head thinking about it and not sure what to say..
    How old is your IP? Was iit running good before hand?
    Not sure how old the IP is. I have a spare, but not sure how to rule this one dead..
    1994 3500HD 6.5 10' flatbed dump dually, 15kgvw. 5spd, 150k. Heath pmd, heath tm, heath chip.

  7. #7
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    Default

    Jump the LP to see if the pump running and getting fuel out of your t-valve without OPS. If the LP runs and fuel out when jump, then LP is good.

    Then, measure the voltage at the connector to the LP down under the driver on the frame. You have to check it with ign key "on". If there is no voltage, then OPS is bad.

    OPS is located underneath the Glow Plug relay toward the driver side from the Fuel filter (very close to the firewall). At least that is where mine is on 95. IIRC, yours should be the same for 94. 96+ is under the intake manifold.
    #####---------######-------#####
    1995 6.5TD GMC Suburban
    PMD in Bumper
    4" Warpspeed Exhaust
    KD LP/OPS Harness
    Bosch Duraterm GP
    Heath Turbo-Master
    Chevron's XLP Diesel Additive

  8. #8
    Just Another Diesel Guy Turbine Doc's Avatar
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    Default

    Since yours is OBD-I you can jumper at diagnostic port and power your lift pump
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    Tim (A-ACLU #29)
    98 (S)K1500,3.73 gear,4L80,Heath 4"exh,Amsoil air & bypass oil flts,Heath fan clutch,Stans Xover,pilar mtd BST/EGT/TRN,remote 12v fan tran cool,PML trans pan, PML diff cover, Hi pops, Heath PCM,Heath remote FSD, HDP Balance Flow, Heath lift pump, SSBC front calipers, EGR rear disc conversion, Goodrich brake lines, No-Slip locker, Roadmaster suspension, Lube specialist oil lines, Putnam lock & load hitch, A-team turbo.

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  9. #9
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    Default

    Quote Originally Posted by Turbine Doc View Post
    Since yours is OBD-I you can jumper at diagnostic port and power your lift pump
    Not sure what the pic is showing. ( I apologize but I'm new to this stuff)
    1994 3500HD 6.5 10' flatbed dump dually, 15kgvw. 5spd, 150k. Heath pmd, heath tm, heath chip.

  10. #10

    Default

    What he is trying to say is that the PIN G on your diagnostic port(located under dash, below steering column) is connected directly to your lift pump. Putting 12 v 's to that port will power your lift pump. You should hear it running and get fuel out of the T-valve.
    This is now a parts truck 95 GMC Ext Cab 2500 4x4, S vin,3" Downpipe,
    4" Exhaust, No Cat, No Muffler,Remote FSD(in bumper),New 5459 IP(272,000mi),-1.94 TDCO,
    #9 resistor,15k resistor on map,14psi boost, Optic Bump,OPS Bypass,Spectre Cone Filter W/ Custom Air Box, Boost and Pyro Guages,Triple Guage Pillar Pod, No Snorkel, Gutted Upper Plenum,"Off Road Mod"(No EGR),Gutted Fuel Cap, New Accessory Drive Harmonic Bal. 295,000 miles on truck

    Daily driver96 GMC Ext. Cab LB 2500 4x4, F vin, 3" Downpipe,3.5" Exhaust Split Into Duals, No Cat or Mufflers,Heath GL4, New Marine Injectors,Hanging ATA Intercooler,Manual Glow Plug Override, Spectre Cone Filter W/ Custom Air Box, Triple Gauge Pillar Pod,Autometer Boost,Pyro and Trans.Temp. Gauges,HO Water Pump, Autometer Fuel Pressure And Water temp Gauges, Gutted fuel Cap,The Cleanest Radiator And Coolers Around!
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