96 E-350 7.5l. Fuel pump went out. It is a single tank van, I think the big 35 gallon one. The parts stores list like 5 different pumps, which damn one do I need? I want to do the job all at once, not in two parts having to take out the old one to see which one I need. Anyone know? Easy job, but not one I want to break into equal halves.