She quit running

Discussion in 'GM 6.5 Diesel Engines' started by 94 6.5 3500HD, Jun 12, 2008.

  1. 94 6.5 3500HD

    94 6.5 3500HD New Member

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    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
     
  2. DEERE3594

    DEERE3594 I welcome everyone...not just Penguins!

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    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?
     
  3. NVW

    NVW Active Member

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    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
     
  4. JMJNet

    JMJNet Recruit

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    Have you checked your OPS? I know it is new LP.
     
  5. 94 6.5 3500HD

    94 6.5 3500HD New Member

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    I'll check fuses today. How do I check the function of the OPS. (not sure where its located either)?
     
  6. 94 6.5 3500HD

    94 6.5 3500HD New Member

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    Not sure how old the IP is. I have a spare, but not sure how to rule this one dead..
     
  7. JMJNet

    JMJNet Recruit

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    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.
     
  8. Turbine Doc

    Turbine Doc Just Another Diesel Guy

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    Since yours is OBD-I you can jumper at diagnostic port and power your lift pump
     

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  9. 94 6.5 3500HD

    94 6.5 3500HD New Member

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    Not sure what the pic is showing. ( I apologize but I'm new to this stuff)
     
  10. DIYORPAY

    DIYORPAY New Member

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    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.
     

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