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Discussion Starter · #1 ·
My truck has a brand new fuel pump. It hums when you turn the key forward. Truck starts and runs for 10 minutes or so then cuts out. After this happens the fuel pump no longer hums and it wont start back up. After a couple of hours it starts back up. Someone mentioned a fuel pump test wire but i can't find it. Could it be the oil pressure sending unit? Ignition module? I'm out of money and snow is coming so i need to plow... So i'm trying to diagnose before buying parts. I did replace the fuel pump relay on a hunch and it didn't work. the truck is a '93 K1500 w/ 305 chevy engine

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