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What engine do you have in this one?
If you have to keep priming the fuel filter, the issue is fuel related and not electrical related. That is the first sign for me.
Some of these 5500s have had broken pick up tubes in the fuel tanks. Have you noticed if the fuel reaches a certain point that this has occurred? If so, then the issue will be in one of the tanks (if you have dual). Otherwise, I would have the fuel lines tested, the crossover valved for the fuel tanks, the fuel filter housing bypasses to see if the housing is causing an issue which is a bad problem with the Isuzu engines, the fuel return check valve if it is a CAT engine, and the head itself for any cracks or pressure loss due to a bad injector cup cauising the fuel to unload in the cylinder and the pressure dropping.
I'm not sure what all was done, but I can assure you the issue is related to the fuel system if you have to keep priming the engine when it shuts down. It is getting air from wither the suction or pickup side ot losing pressure on the pressure side due to check valves or pressure regulator or cracked head.
I hope this narrows it down.
Also, if this is a Isuzu or CAT, take the truck to a medium truck repair shop for they will be better able to service it versus Chevrolet in Spartansburg. If you are ok to get the truck to Columbia, Shealy is the best shop in the state for the Chevrolet with the Isuzu engines. I'm in Florida and we send our fleet trucks to them rom all over SC and TN to them if we can.
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