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Replace all of the soft fuel lines. That should be the first thing you do when you have stalling issues with these trucks. If it isn't sucking air, then that means the shutdown solenoid is faulty and must be removed (8.3L), or replaced (nhc250).

It is hard to kill those old pumps. I'm still betting on something else.

Yeah. Do it with the power switches on and that screw on the solenoid turned all the way in. If you end up getting fuel from the line by the injector pump then you know that your problem is that you are sucking air somewhere and that should make the problem evident one way or another. If you...

Do you have the large filter canister in the wheel well behind the driver side steer tire? If so, get a 1/2" to 1/2" male to male brass fitting and bypass it, then try again. Also pull the fuel line off directly before it enters the injection pump and put some air pressure to the fuel tank. Be...