Author Topic: Fuel pump timing  (Read 1243 times)


  • Newbie
  • *
  • Posts: 1
    • View Profile
Fuel pump timing
« on: February 25, 2023, 12:40:26 PM »
Good morning everyone

I have a military generator, a mep-803, after picking it up, noticed someone was in there messing with the #1 and #2 fuel pumps. It starts but when I take off the exhaust manifold, 1 and 2 are smoking white, pretty sure too much fuel is being injected into the cylinders. 3 and 4 are running properly.

I found the technical manual, but running into an issue. It says to measure the pump from about the middle to the bottom of the spring, supposed to be 2.02 inches according to the diagram. But when I measure it, getting 2.23. Is this a misprint in the manual ? Did they mean to write 2.22 inches ? That would make more sense.

Does anyone have the proper factory manual for setting the fuel pumps ?

Thanks in advance for any help.


  • Hero Member
  • *****
  • Posts: 2338
    • View Profile
Re: Fuel pump timing
« Reply #1 on: February 25, 2023, 12:48:02 PM »
Follwing up on an engine that others have diddled with is always an adventure.. Has the engine been run long enough to get all the air out of the system? White smoke is unignited fuel , not too much fuel, that would be black. I can't help you with the specs but if the engine had been sitting a long while my money would be on stuck pintles in the injectors. Lacking an injector tester it's  easy enough to check by swapping 1 and 2 for 3 and 4.  If the problem moves then its the injectors, if not then it could be any of several other things. Another easy check is if the smoke clears up a bit and changes blue when the engine warms up but the exhaust smells putrid and makes your eyes water then you have stuck or leaking injectors. Bottle cures can help stuck injectors if not severely stuck.
« Last Edit: February 25, 2023, 01:01:59 PM by 38ac »
Collector and horder of about anything diesel

32 coupe

  • Hero Member
  • *****
  • Posts: 531
  • "Doc Johnson" on call !
    • View Profile
Re: Fuel pump timing
« Reply #2 on: February 26, 2023, 01:43:27 AM »
I would suggest you head over to a site called:
Steel Soldiers

Become a member, it's free. Look for the generator section....
Members will direct you to the proper manuals and advice.

I have a 803 and without the SS site I would be lost.
Most members are x military and well versed in these machines.
They know wbere to get parts as well.


PS...Don't be afraid to ask questions ! They are a very helpful group.

« Last Edit: February 26, 2023, 02:35:47 AM by 32 coupe »
Metro 6/1 turning a ST 7.5 KW gen head
Changfa 1115 turning a ST 15 KW gen head
Ashwamegh 2/25
John Deere 110 TBL
New Holland TC 30

"I was sitting here reading this thinking what an idiot you are until I realized it was one of my earlier posts !"