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  1. simp5782

    M923 nhc250 replaced injector pump still no joy!

    Should fire at no throttle with a good fuel system. Some ether may be used if below 32 degrees
  2. simp5782

    M923 nhc250 replaced injector pump still no joy!

    The direct feed with a new line is the best measure to start. You can pull the valve cover and ensure they are moving. and use a listening device to see if they are firing when the engine is spinning over.
  3. simp5782

    M923 nhc250 replaced injector pump still no joy!

    That is called a pressure reduction cylinder. It just slows the return flow down. You can ditch it which should be done anyway. The return line should go from the Head to a T which splits into a pump return and return to the tank. Those cylinders are known to gunk up and cause issues. They...
  4. simp5782

    M923 nhc250 replaced injector pump still no joy!

    Build a fire under it and get it warm. Reprime it. And go from there. Get that motor hot. More than likely you have some injector orings that are sucking air.
  5. simp5782

    M923 nhc250 replaced injector pump still no joy!

    unlikely with either non top or top stop injectors. Is does have 24v power to the fuel solenoid correct? Not just that fuel is coming out of it. It can let a little by even when not powered. I mean the O rings on the injectors could be sucking air and not letting it do anything since it is...
  6. simp5782

    M923 nhc250 replaced injector pump still no joy!

    about the only way is to take that line off. If you have a line wrench it is pretty easy. a regular wrench will just round it off especially if it is rusted up. It is a metal line so i wouldnt think that it has anything wrong with it. You can tell on the return fuel is to take the line off...
  7. simp5782

    M923 nhc250 replaced injector pump still no joy!

    Did you screw the knob in on the front of the solenoid and see if it would start? I take it that you used the shutoff valve from the other truck when you swapped the pumps. Did you ensure you have 24v to the fuel solenoid? Is your manual shut off valve in good shape? Sometimes they can get...
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