Hi, in my case, there was a fuel level gauge fault. Inside are tiny wires used like coils and one connection was broken. Fuel gauge also affects temperature gauge. From behind the dash check if on position signed 7V is about 7 volts. If not, that is the problem.
SOURCE: fuel gauge
Similar to above. Loosen the screw holding the dash panel and insert a paper clip or screwdriver to lift needle over rest bar.
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: the gauges on my fiat scudo ie temperature ,speedo ,,clock mileag
check fuse 5 and 12 behind glove box
SOURCE: mercedes C240 estate strange fuel guage readings
It sounds like it might have lost its ground, or maybe the electrical connection to the sending unit on tank, chk. all that first, if no change on guage it might be a problem with the flote in the tank.
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