Fuel gauge always worked fine. But one day i started the truck and gauge read below empty and my fuel light came on. It will not raise no natter how much fuel is in the tank. I have changed a fuel sending unit in one of these trucks before. It is a total PITA. So i was wondering if there is something i could check first like a ground or something? Thanks guys

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make sure wires are plugged in?

 

when I bought mine the float had dissolved literality! maybe that your problem...