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Thread: 4d55t starts and idles, then dies, no accelleration.. any clues?

  1. #1

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    1983 Dodge Ram 50
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    4D55-T

    4d55t starts and idles, then dies, no accelleration.. any clues?

    I purchased this truck 1983 dodge d50, knowing it was a pig in a poke. Old owner is diseased and I have no prior info. Wife said it broke down, then he was working on it and never got it running then it sat for 10 years. Today with fresh diesel, it cranks fires and idles for about a minute then craps out. I have bled the injectors, seems lift pump is supplying adaquate fuel to the injection pump. Removed timing cover verified timing is correct on the belt, have not checked lift timing on the injection pump. I need the manual to follow procedure. I have a feely something is gooed up in the injection pump. Any good service manuals online that show the disassembly of the injection pump, are rebuild kits available.. any help or suggestions about be appreciated, as well as links to technical data. Thanks 😊

  2. #2



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    Sounds like it's sucking air. I would drop in new fuel lines with the proper clamps to make sure that is good.
    I would also make sure the filters are new.
    From that it might be the lift pump not giving enough pressure. It is 30 years old and rubber gets hard.
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  3. #3

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    Sucking air definitely sounds like it could be a culprit. What does it do when it dies? Does is just stop all at once like you shut the key off, or does it get weaker and weaker until it dies?

  4. #4

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    I would start at the fuel filters as well. Will it run if you just have the fuel supply line stuck in a bottle of fuel? Bypass everything from the tank to the pump that way.
    If that doesn't work, then keep troubleshooting your way towards the injectors.

  5. #5

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    It gets weaker and weaker till it stalls, then it will start back up and do the same thing. Runs for about 30 sec then quits or does if I crack throttle valve. It has an in line pump between tank and fuel filter housing. I assume original pump was in file filter housing since it has alot of wires to it.

  6. #6

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    I removed the return line while it was runing it's returning fuel to the tank, did not show signs of being airated from a bad supply line. Flowed clear no bubbles. Can someone verify the original lift pump location, in the filter housing or other location under the vehicle or in tank?

  7. #7

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    Some more diagnosis, I eliminated the fuel system completely, ran a new pump and new hoses to a five gallon jug of new fresh diesel. Same results, starts then runs for one minute.. or less then dies. I advanced injection pump and now it will accelerate but then acts like a gas motor starved for fuel and dies.. will do this over and over again without having to bleed injectors.. Wich makes me think internal injection pump issue, blockage or failure.. any feedback?

  8. #8

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    Have you pulled the injectors to look at the nozzle end? When I did my head and had everything apart I looked at mine. One of them looked like the end was starting to get pitted and I questioned whether they'd continue to flow for any length of time. I do not daily the truck but 2k later and everything is okay.
    Others with more experience can verify if a bad spray can cause the issues you are having

  9. #9

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    its possible the cut off solenoid on the side of the injection pump (powered to allow fuel into pump) is failing and slowly closes as the solenoid gets warm

  10. #10

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    Good thought! I'll try it outside the pump and see if that's happening. Thx

  11. #11

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    Quote Originally Posted by Dieseldude View Post
    Can someone verify the original lift pump location, in the filter housing or other location under the vehicle or in tank?
    These trucks do not have a lift pump from the tank. The injection pump is the only thing bringing fuel from the tank to the injector.

    Quote Originally Posted by skullzaflare View Post
    its possible the cut off solenoid on the side of the injection pump (powered to allow fuel into pump) is failing and slowly closes as the solenoid gets warm
    Never would have thought as this as an issue. It's definitely plausible. I guess I just assume it would fail all at once and either let fuel past or not. I would be more suspicious of a wire or ground if you narrowed it down to the cut off solenoid. Good broad thinking though.

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