Fuel sensor issue

Please explain this. The pump works fine.

John

you need a new fuel pump, not a new sensor/float

Yes, please explain, and like Gary Glaenzers grandpappy used to say, "it better be good."

While they use the same wiring harness, and share a common ground wire back to the frame, one will not effect the other. I see from previous posts, you're the guy that recommended putting sand in the oil, and mixing brake fluid with transmission fluid. I think I will ignore your advice.

John

Of course it does, but you're getting a false fuel level reading due to a short in the wiring on the pump.

Hi!

Definitely check that ground. Bad grounds can (and will) cause very strange behavior.

It's also a possibility that the dash gauge isn't working properly. It's very likely that the ones in your truck are actually stepper motors and the one for the fuel gauge could be sticking or defective. Since the measurement of fuel level is made by varying electrical resistance, you could try shorting across the wires for it to see what the gauge does.

William

Actually, a bad ground would make it go to full, since that's what an open circuit does. When you short the wires, it goes to empty. (I did do that). As I said in the original post, the gauge itself appears to function properly. The float in the up position isn't generating enough resistance to bring the needle to the full mark, leading to believe there is a resistor somewhere in the circuit that is shorted out.

John