Did you check the ground wire on the frame. There is a ground wire that is bolted to the top frame rail near the left rear wheel opening. I've seen that wire break or get corroded where it bolts to the frame. I'm not sure of the location on a 1998 but that's where it is on the earlier models as well as the full size trucks. That wire also grounds the gas gauge, does the gas gauge read goofy? Also keep in mind the pump only runs for 3-5 seconds then it shut off, until the engine starts, or the starter is engaged. Good luck!
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