Just happened recently. As far as i know it was working prior to filling it up.. filled it up and started it and the gas light is on and the gauge is at the red line in empty. I pulled a few wiring diagrams for it and found 3 wires going from the TIPM to the fuel pump module. B+ to fuel pump, fuel level signal, and sensor ground. However i was unable to access the plug because it is above the fuel tank. I was able to get to the grommet in the floorpan from under the back seat that ran from the fuel pump connector to a connector inside, but i would have had to backprobe the wires to be able to get an accurate reading. My thought process was to ground the signal wire and see if the gauge moves.. thus eliminating any wiring / module issues from that point forward to the TIPM. Also there was no check engine light, and no codes stored or pending.
I know its probably a faulty sending unit, but i don’t like to throw parts at a car. I want to be sure that this is the problem 100% before doing so. Also this is a friend’s car so i will not make him pay for something without being sure.. not to mention draining a full tank of gas, dropping the tank and possibly replacing something that is not the problem.
Any ideas exactly what to check from here? Ill upload the wiring diagram I used so that may aid in assisting me. I only looked at the car for about a half hour, but had limited resources and not much time.
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