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What I finally did on my M931A2 after chasing the loss of prime problem for way to long was to shotgun the fuel delivery source. I replaced everything from the tank to the engine block. Lines, fuel filter and filter holder. Added a ball valve also. You can read more in post #21 which...

It has been 7 or 8 days since I last tried to start the truck. Turned on the ball valve and started the engine. Blew a little smoke for about 20 seconds or so and then went into a good smooth fast idle (I use 900 for fast idle). Ran very well and did not have to prime. I am going to call it...

Got done with the 4th parade today so I got back to the truck fix. Replaced all fittings/hoses/and the first fuel filter holder and a good CAT filter installed. Also added the ball valve directly to the input of the filter holder. Will wait a few days and see if I did good or what.

Yep!

Been 7 more days since I last ran the truck. The hose directly from the input of the first fuel filter to the tank seems to have taken care of the problem. Truck started right up without any problem. So it looks like there is a problem with one of the hose/pipe connections, hose itself or the...

Well the saga continues. It has been 9 days since I last ran the truck (M931A2). Started right up and ran for about a minute or so and quit. Primed and it ran very well. So today I ran a temp 1/2 inch hose directly from the ball valve on the large filter input to the left tank (remember the...

It has been a week since I last shut down the truck. Started it today and after a minute or so it quit. So the check valve did not solve my problem. The check valve itself did what it was supposed to however. So the check valve is a good deal if you want to be sure to prevent back leakage at...

Got the adjustable check valve today. Installed it, purged air from system and ran truck for a few miles. Everything ran normally. No excessive smoke when I started it or when it was running. I will let the truck sit for a few days and start it and see how it works. Will get back to you...

That could well be Will. As we all know Cummins is great for upgrading parts etc. When I was replacing the transfer pump on the 8.3 I came up with around 3 or so numbers for the same basic transfer pump. So I called the Cummins distributer to get the latest number. When I was cleaning the...

Richard this is the standard return check valve used in most 8.3s. There is another style but I am not sure if it was used in the military version of the 8.3. Part number for the one used in the military 8.3s is 1-417-413-047 You can see what the adjustable replacement I am going to use looks...

Crazy..........While waiting for the adjustable check valve to get here I decided to remove the existing one and take a look at it. Looked to me like there was some crud in it. Took the brake cleaner and cleaned it out. Some crap came out. Also used a small plastic rod to push back the ball...

I am trying to make this thread more searchable. Change the title Clinto if you can come up with a better title. There are a few threads about a problem with the return fuel check valve on the M939A2 series. The check valve is the same one used on the older Dodge Cummins 5.9 pumps. And there...