A 1996 Cummins/Dodge will not have an electrical lift pump so don't listen for a humming noise, it won't happen. It uses a mechanical lift pump on the lower rear drivers side of the block.
I would start with the fuel filter, it's cheap.
Next thing I would check is your grid heater. This is on the elbow that dumps into the head/intake. If it runs fine and does not surge when warm, that is most likely what I would think it is. Like most electrical things, they are also known for going bad from age. Try plugging it in for a night, if it starts and runs fine in the morning it's a heat issue.
Next I would check your fuel system for air in the line. You would need a foot or two of clear 5/16" hose, and a double barb fitting. At the rear of the engine on the drivers side there is a suction and return line, the return is smaller than the suction on most years. If your's isn't than you will need 3/8" hose and barb. But pull off your return line where the steel meets the rubber, put the piece of plastic hose in there, start the truck and look at the fuel to see if there is air in there. If there is air in the return line (the fuel will not be clear) than I would check my fuel heater, those are known for causing air leaks since they are on the suction side of the system. Another thing this will cause is a bit of surging when there is no load on the engine at an idle.
Just about every Dodge diesel from that era the fuel gauge doesn't work. It doesn't effect any other part of the operation of the truck. I've parted a few of these trucks out. Any other questions just ask.
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