with electrical power is put in the car the gas needle willgo to pass fulland not work.

Asked by Dec 19, 2012 at 03:45 AM about the 1988 Chevrolet Cavalier

Question type: Maintenance & Repair

when batteries out of car it will work
and float properly.
all this took place on changing fuel
pump

2 Answers

33,935

The gauge is being powered by the fuel pumps power source. To positively prove it, it only happens when you first turn the key on and while its running correct? The fuel level sending unit works off a rheostat resistor which has little or no resistance with the tank full and resistance increases as the tank empties. With less resistance comes less amperage. If its constantly getting 12 volts that is free of resistance then it will show it's a full tank.

1 of 1 people found this helpful.
12,925

Recheck the electrical connection to the fuel pump. Look for corrosion and damage to pins in connectors.

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