6.2 injection pump - Steel Soldiers::Military Vehicles Supersite

chester247 · 01-10-2009, 16:55

6.2 injection pump
what does the return line check valve in the top cover of the injection pump do??

Westech · 01-10-2009, 17:39

what check valve? The line in the top of the pump is for the cold start timing advance. post a pic and I can tell you 100%

chester247 · 01-10-2009, 22:21

thanks
the fitting that the return line connects to on top of the injection pump .

chester247 · 01-10-2009, 22:29

also can i replace the orings on the ip without removing the pump ?
i see some fuel is leaking from the pump into the valley on top

thanks

Westech · 01-10-2009, 23:17

what o rings? you mean the sleeves on the Throttle shaft?

acmunro · 01-11-2009, 01:41

It plugs up and then the truck will not run, at least that is the case on my M1010. I need to get around to changing that injector pump.

Westech · 01-11-2009, 09:59

plugs up? with what? If you have a good fuel filter it should just be clean fuel in there and nothing to plug up.

acmunro · 01-11-2009, 10:25

Better check the text book teach, I have clean fuel to the IP. On 1985 and older 6.2's the Governor weight retainer ring breaks down when subjected to water in fuel or alcohol. I thought I could get by by cleaning the check valve and pulling the top of the injector pump and cleaning, but no dice in my case. I don't know how large the retaining ring is, but it sure makes a lot of crap.

Westech · 01-11-2009, 10:33

Ah I never herd of that before. Well there will be a point when that ring just goes south and its all over. I would just replace the pump. you only have to take off the intake and the oil filler tube to do it (done it). I see them on egay all day cheap. I don't know if its worth the hassle to rebuild it rather then replace due to the low cost of the pumps.

acmunro · 01-11-2009, 10:44

I learned the hard way, truck lost power and stopped running completely. First thought was replace the fuel filter. I did and it almost started, but did not. I did some research and found out about the retainer break down problem. I removed the check valve and used carb cleaner got some crud out. I put the check valve back in and it started right up. It then stopped running. I pulled the top off and cleaned a lot of junk out of the IP. Ran good for a while, but again it stopped. To get it home once I put a barbed fitting in and an old style fuel filter to catch the debris. Made it home, but long story short. I need to replace that pump.