Fuel warning light stays on despite full tank and correct gauge

power goes through the gauge down to the sender unit ,through the resistance to ground
what you have indicates a short in the wire after the gauge and before the sender unit

Sending unit is bad its float thats in the tank reads to the gauge very rare that it will be the cluster its self could even be a ground in some cases

its 1 of 2 things.
1: the fuel is low, use a dip stick, if gauge reads ok.
2; or the tank sender is bad, but gauge reads wrong.
3: the guage wire is disconnected, cut or corroded connections.

The sensor is part of the fuel pump module inside the gas tank.
The signal is sent to the body computer, so it could be a faulty module or a problem with the body computer.
The circuit would need to be checked with a meter.

Fuel gauge working correctly?? Sometimes these low fuel lights are triggered by the fuel guage, which is triggered by a float that is in the tank.

Seems to me the indicator/sensor/relay, which is probably located in the fuel tank.... shorted out. I know this sounds strange, but rock the back of the car as if you were checking the shocks/struts, when the car has a 1/4 tank or lower.

in side the tank on the side of the pump there is what thy call a sender not to be confused with the sending unit. The sender is atached to the float and tells the gauge how much fuel you have.

there is a fuel senor inside of the tank and it could very well be the problem

The float in the tank may be bad or stuck. The sending unit could also be bad. Either way, you're gonna have to pull the fuel pump out of the tank.

change fuel gauge sensor in the fuel tank

to the right , i am assuming to the "full tank" reading. am i right?

if i am right, the wire from the gas tank is sending a full tank signal what ever the content of the tank.

meaning the wire is shorted to ground.
or the sending unit is faulty. there is a short to ground reading between the sending unit.

you can test which one is faulty. remove the wire from the sending unit. observe the gauge. if the gauge would go to " empty" then the culprit is the sending unit. if it stays on " full tank", then the wire is faulty.

WARNING: GASOLINE IS EXTREMELY FLAMMABLE. BE VERY CAREFUL IN HANDLING NEAR THEM.


tnx 4 using fixya,

drcool