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My M923A1 had the same problem with the tank. Glad you found it.
http://www.steelsoldiers.com/showthread.php?79327-M923A1-losing-prime&highlight=fuel+tank
Must be one of the check valves is not working. Look at the P2P software in the 5 ton manual area and that will help you.
http://www.steelsoldiers.com/showthread.php?79228-TM-s-for-the-939-series-trucks
You need to look for the timing mark on the Harmonic Balancer and pointer on the front of the motor, The pointer needs to be on the mark and cylinder one valves needs to be closed.
Remember you may have to turn it over 360 degrees to get and that line up. You can have it 180 out if you do not...
No marks on gear, you use that to set the pump to the timing of the motor. Use the time mark on the HD head and the mark on the top of the pump under the little cover plate with the four bolts.
I know this sounds off the wall, but make sure your vent on the front services side glad hand is open and it is working.
If there is a ball valve there open it. the truck needs to vent out the front service glad hand when you release thebrakes.
It happened to me and that was the problem.
If you...
We used my M936 about a month ago to pull and replace a motor and trans in a M925.
Pulled a HD Cylinder on my motor grader.
Also used it to put the hard top on it self.