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Thread: M923 nhc250 replaced injector pump still no joy!

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    Sergeant Major Over's Avatar
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    Default M923 nhc250 replaced injector pump still no joy!

    I have a M923A0 that I used to haul water. Slowly last year it needed a bump in throttle to keep idling at lights. It slowly got worse then I parked it. This year I pulled the fuel filter which had crap in it. Cleaned it all up, new filter, new line from tank to injector pump but still wouldn't start. Would only run on starter fluid. Pressurized tank and got good flow to pump and no leaks. Unhooked pump outlet injector line and noticed just a oozing of diesel out of it when starting. Also checked shutoff valve. Finally figured maybe the pump is bad as even when starting on fluid just an ooze of diesel on the injector pump outlet. Well...I pulled a pump from another known good runner M923A0 I have and installed it. Primed good, pressurized no leaks and flow out of large return line. Still wont start!!!!! Any thoughts?
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    Sergeant Major Over's Avatar
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    Quote Originally Posted by Over View Post
    I have a M923A0 that I used to haul water. Slowly last year it needed a bump in throttle to keep idling at lights. It slowly got worse then I parked it. This year I pulled the fuel filter which had crap in it. Cleaned it all up, new filter, new line from tank to injector pump but still wouldn't start. Would only run on starter fluid. Pressurized tank and got good flow to pump and no leaks. Unhooked pump outlet injector line and noticed just a oozing of diesel out of it when starting. Also checked shutoff valve. Finally figured maybe the pump is bad as even when starting on fluid just an ooze of diesel on the injector pump outlet. Well...I pulled a pump from another known good runner M923A0 I have and installed it. Primed good, pressurized no leaks and flow out of large return line. Still wont start!!!!! Any thoughts?
    I also noted when I pulled the pump that the shaft on the air compressor rotated when starting.
    M923A0 "PATROL" The successful a/c experiment! FOR SALE
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    1995 6.5 Turbo Diesel Burb, 4x4
    Assorted Diesel MEP 5kw and 10kw Generators
    Ural (Russian BMW) with Side Car (Driven Side Car Wheel)
    Will go anywhere a ATV can go! MG42 Mount on Side Car
    If this was the 70's I would have been carrying the ice and beer!
    1945 M29 Weasel Tracked-SOLD
    Chenowith DPV (Only one in the USA) SOLD

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    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 weak internally and close on their own when fuel goes by them it is kind of like a flutter.

    It takes a good bit of ether on these trucks to get them back running even with a new pump being installed.
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    Sergeant Major Over's Avatar
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    Hi..Like your videos by the way. I used your PT pump install for reference! No I have the other pumps shutoff which is good. I just stepped back in after pulling the line on top and in turning over it bubbled up maybe 1" so diesel is getting to the line. Whats an easy way to check that its making it to the injectors, I noticed a line in front of the head but it was tight but a 1/2" wrench didn't wrap around it tight.
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    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 of the return valve that is below the front runner on the intake manifold. It will be a little round cylinder there with a line going in at the top and coming out at the bottom. Pull it off before the valve and see if you have fuel coming out. If there is fuel going in then the injectors should fire unless they just gave out or you broke something in the valve train. Rounding all the cam lobes off sounds unlikely so that no injectors would fire.
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    The only reliable way I know to ensure it's making it to the injectors would be to remove the return line. There are two steel lines going into the front cylinder head, trace the lower one back to a T-fitting just below the intake manifold. Disconnect the left line and crank away to see if you have fuel. Honestly though if you have fuel at that line, you should have a running truck. Did you fill the fuel filter can prior to re-installing? The PT pump is fairly good as self priming but it cannot easily do so if the cannister is empty. I learned that my priming pump was defective when changing my fuel filter once. Turned over and over and never fired. Filled the cannister, reinstalled and it started within a minute. I also replaced my injection pump once. It started within a minute as I had not disturbed the fuel filter and the cannister was full.
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    Hi...Went out and loosened that line and started with starter fluid. It wet the side of the motor, no soldier B to film. Went thru another can trying to start, no go. Could all 6 of the injector took a dump from sitting a year? Never heard of that but I'm stumped.
    The filter canister is full and fuel runs to the pump line when pressurized. I just don't want to keep throwing cans of starter fluid at it. It ran when parked, though really crappy due to the crap on the fuel filter I figured. Everything is clean and sealed now?
    I saw the air compressor shaft spinning when I pulled the pump and turned it over, also when attempting to start it builds air.
    Last edited by Over; 12-30-2018 at 20:45.
    M923A0 "PATROL" The successful a/c experiment! FOR SALE
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    HMMWV 1989 4 door soft top
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    M923A0 Marine with locking axles FOR SALE
    M925A0 Camo FOR SALE
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    1995 F350 PowerStroke, Crew Cab, Long Bed 4x4 with 250,000 on it
    1995 6.5 Turbo Diesel Burb, 4x4
    Assorted Diesel MEP 5kw and 10kw Generators
    Ural (Russian BMW) with Side Car (Driven Side Car Wheel)
    Will go anywhere a ATV can go! MG42 Mount on Side Car
    If this was the 70's I would have been carrying the ice and beer!
    1945 M29 Weasel Tracked-SOLD
    Chenowith DPV (Only one in the USA) SOLD

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    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 just sucking air.

    One thing I can suggest to make it easier to get going is to build a fire under it or plug the block heater in to get it warm. I know its not too cool there but it will help.

    Most trucks I work on it bleeds and fires in a matter of a few turns of the motor.
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    M1078
    M796 Bolster
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    MEP-804A


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    Sergeant Major Over's Avatar
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    Yes it has power to the solenoid, plus it's the same as when I pulled it of the other truck that ran fine. I'm freakin stumped. I'm going to run a continuous pressure on the tank and try starting that way. Should rule out air leaks even though when pressurized I see no leaks. So far 3 days of replacing and going thru everything on this and it's driving me crazy! It's the Marine truck, lol!

    Just in case I screwed in the combat mode screw on the solenoid.

    Went out to start with 10-20 lbs pressure in tank, nothing!

    Question: Is it possible the shaft from the air compressor is slipping internally or is it a solid connection? Also what pounds pressure should come out the IP pump, I understand 25 lbs at turnover? That's the next thing to check but honestly this is a pump off a running truck?

    What are the other solenoids on the pump. One on top and a bigger one on the bottom. Could electrical in these case a problem?
    Last edited by Over; 12-30-2018 at 20:47.
    M923A0 "PATROL" The successful a/c experiment! FOR SALE
    A/C; Air Ride Seat; Tinted Windows; 24-12 100 Amp Converter; Solargizer
    HMMWV 1989 4 door soft top
    M936A2 Wrecker (My mobile Cherry Picker)
    M923A0 Tan FOR SALE
    M923A0 Marine with locking axles FOR SALE
    M925A0 Camo FOR SALE
    M923A2 Camo
    1995 F350 PowerStroke, Crew Cab, Long Bed 4x4 with 250,000 on it
    1995 6.5 Turbo Diesel Burb, 4x4
    Assorted Diesel MEP 5kw and 10kw Generators
    Ural (Russian BMW) with Side Car (Driven Side Car Wheel)
    Will go anywhere a ATV can go! MG42 Mount on Side Car
    If this was the 70's I would have been carrying the ice and beer!
    1945 M29 Weasel Tracked-SOLD
    Chenowith DPV (Only one in the USA) SOLD

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    So just an fyi. Easy on the starting fluid. I've had more than one diesel engine apart that had been overdone. Breaks rings like its its job.

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