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Car Forum / Chevrolet / Chevrolet Trucks / July 2008Fuel sensor issue
I have a 1988 Chevy S10 pickup with a fuel sensor issue. The gauge will only go up to about 1/2 mark when full. With the sensor disconnected (open circuit) the gauge goes all the way to full, leading me to believe the gauge itself is OK. I replaced the sensor in the tank with a new one, but it did the same thing, only up to 1/2 mark with the float in the fully raised position. Sent the new sensor back and put the old one back in. My question is - is there a resistor in the circuit somewhere (That maybe has shorted out) that would raise the resistance of the circuit, and make the needle go to full? John you need a new fuel pump, not a new sensor/float > I have a 1988 Chevy S10 pickup with a fuel sensor issue. The gauge will > only go up to about 1/2 mark when full. With the sensor disconnected (open [quoted text clipped - 8 lines] > > John Please explain this. The pump works fine. John > you need a new fuel pump, not a new sensor/float > [quoted text clipped - 13 lines] >> >> John > Please explain this. The pump works fine. Yes, please explain, and like Gary Glaenzers grandpappy used to say, "it better be good." > Please explain this. The pump works fine. Of course it does, but you're getting a false fuel level reading due to a short in the wiring on the pump. >> Please explain this. The pump works fine. > > Of course it does, but you're getting a false fuel level reading due to a > short in the wiring on the pump. 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 Hi! > While they use the same wiring harness, and share a common ground > wire back to the frame, one will not effect the other. 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 > Hi! > [quoted text clipped - 11 lines] > > 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 |
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