SOURCE: Fuel gauge not working properly Hyundai Accent
The fuel gauge utilizes a voltage stabilizer located on the back of the instrument cluster. if it's faulty it could cause this problem. The other causes are a wire fault (short) between the gauge and the tank sending unit and the sending unit itself being corroded and stuck in the full position (the float assembly that is). One way to quickly isolate (and maybe eliminate) the problem is to get a used cluster from a wrecking yard and swap it out. If it works normally, there you go... if not you will need to access the tank sending unit (this usually, but not always, involves draining and dropping the tank to get to it. Some cars have an access panel in the body over the fuel tank for this purpose... look under the carpeting in the rear of the vehicle) Once you have access disconnect the power wire (usually red or with a red stripe), and with the key on, the gauge should drop to empty. If it doesn't, the problem is not the sending unit. Hope this helps...;-)
SOURCE: my gas gauge on my 93 ford mustang quit working.
i suspect a broken wire between guage and sender unit in tank, but the sending unit could be bad,find the wire to the float guage in the tank and disconnect it, if fuel level does not change then then touch the wire to a ground, if the guage changes then the wire is ok and the unit is bad, if it does not change check wiring and guage for faults.
SOURCE: fuel gauge stuck on full for my 2000 ford taurus SE
it is probbally the fuel pump in the gas tank. It has a float like the one in your toilet and a sensor attached to it to tell you how much gas you have.
SOURCE: 2000 ford ranger gas gauge stuck on full on or
REPLACE THE SENDER ASSEMBLY IN THE TANK IT USUALLY WILL COME WITH A PUMP ALSO.
TIM.
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