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You can open the valve whenever you want. I was just stating that leaving it open while running, as in the video, any pressure going out the valve will not be pushing fuel to the IP. If the lift pump is working properly, with the engine off and not cranking, you will get liquid out of the...

That did not look like enough fuel coming from the water drain. Also, if you leave that drain open while running, won't that be removing pressure from the other line going to the injection pump?

Since no one likes to look in the TMs, I did it for you. The fuel system troubleshhoting section is around page 2-95 of TM 9-2320-280-20-2. There is even a section on "how to use the troubleshooting guide". STEP 2. Does the engine start and stay running? If no, go to B, Page 2-106. ...

Did you look for the vent line on top of the power steering reservoir and other parts to see where it goes? Also, If the fording switch is missing, that could be another destination. If the switch is there, remove the doghouse and feel the back of the switch. There are 3 connections on it.

look or feel the bottom of the hydroboost. EDIT: That may get it's own line. Check power steering reservoir and top of master cylinfder (plastic versions). It looks like a vent line to me.