2003 M1123 6.5L injection pump issues HELP!

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Roger0that

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I have done a head job on my 2003 HMMV, and after putting everything together I am not getting any fuel at the injectors.
I have performed the following test:
  1. The fuel filter is primed and has new filters
  2. I am getting voltage on 54A and the governor (click sound when energized)
  3. Removed all injector lines and turned until drained my batteries 4 times
  4. Removed the glow plugs, installed back the injector lines and turned a bunch of times
  5. Added pressure to the fuel tank (saw on another thread by a sheriff) full throttle and turned, nothing
  6. I have even added a bleeding device on the injectors and gave it about 10-15psi to get some fuel and nothing
Any suggestions? I am thinking that maybe my fuel injectors pump when bad after being open with no lines for over 5 months.

I appreciate all your expertise inregards to this matter since I am getting frustrated by the minute.
Roger
 

NDT

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Are you getting good pressure from the mechanical pump up to the injection pump? Did it ever run before?
 

Roger0that

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Are you getting good pressure from the mechanical pump up to the injection pump? Did it ever run before?
Yes, this vehicle was running prior. I have not checked if the pressure is between 7-10 I believe is what needs to be. I can tell you that when actuating the water trap valve it squirts hard, same as the purging screw at the top of the filter.
 

NDT

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Well it can be assumed that if you are getting plenty of pressure to the injection pump, getting voltage to the solenoid and it is moving inside, your injection pump needs to go out for rebuild.
 

Roger0that

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Well it can be assumed that if you are getting plenty of pressure to the injection pump, getting voltage to the solenoid and it is moving inside, your injection pump needs to go out for rebuild.
I was afraid of that 😔 but wanted to hear it from somebody else.
 

Retiredwarhorses

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Pull the pump cover and check that the armature for the cutoff is easily Manipulated with your Pinky finger...it’s a very fine return spring and does not take much crap to make it not move when the solenoid is energized.
50% of the m1123’s I get in the shop have bad pumps due to sitting for 11yrs in the Barstow desert.
 

Roger0that

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Pull the pump cover and check that the armature for the cutoff is easily Manipulated with your Pinky finger...it’s a very fine return spring and does not take much crap to make it not move when the solenoid is energized.
50% of the m1123’s I get in the shop have bad pumps due to sitting for 11yrs in the Barstow desert.
Good!!! I will try this tomorrow.

Thanks 🙏🏽
 
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