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Cam Davis Thanks for the tip on rubber lines on the selector valve. I've looked them over and they are showing small surface cracks. I'm awaiting better weather to mess with them.

The part number for the lift pump I bought from Highway and Heavy parts is 4988749. It looks like the one you see on most trucks with the fuel line connection on top and the hand primer on the bottom. It is not the original that the trucks came with but an improved replacement. You won't...

I also tried a new lift pump ( no help there) but I only paid $56 from Highway and Heavy Parts online. I also changed the canister filter gasket and O ring as well as the Schrader valve on top of the filter canister.

I put the Torks OFV020 check valve on my truck after finding the check valve installed on the truck without any guts ie just a straight through hole. It didn't make any difference at all. Truck still loses prime after 24 hours and doesn't run any different. So I'm still looking for the culprit.

Look at the Parts and Tools Volume 1 figure 58. It's part number 1 in the figure. The manual is TM 9-2320-272-24P-1 Page 0059-2 03/15/2011 Rel(1.8) root(plwp) wpno(R00059)

Ok I've confirmed that I have been examining the right part on the injection pump (IP. I didn't think the truck would run without this valve at least providing some back pressure to the IP?

I pulled out what I think is my return fuel check valve. It is towards the forward end of the pump with a fuel hose attached to it that goes straight down and then behind the frame rail of the truck. It seems to have no guts and really has no valve in it? It has a small bolt in the end of it...

I have had this problem on 2 M939A2 trucks and still have it on a a third.. On one it was the line from the tank to the large canister filter. It was deteriorated and had small pin holes that spewed fuel when pressurized ( To pressurize the line I just took it off the canister filter and then...