2. Check the fuel gauge sending unit. The fuel gauge sending unit is located on the top of the fuel tank and is responsible for sending the signal from the fuel level sensor to the gas gauge. If the sending unit is faulty, it will not be able to accurately transmit the fuel level signal and the gas gauge will not read correctly. To check the fuel gauge sending unit, disconnect it from the fuel tank and inspect it for damage. If the sending unit is damaged, replace it with a new one.
3. Check the wiring. The wiring between the fuel level sensor, fuel gauge sending unit, and gas gauge can become damaged or corroded, which can also cause the gas gauge to read incorrectly. To check the wiring, inspect it for any damage or corrosion. If any damage or corrosion is found, repair or replace the wiring as necessary.
4. Replace the gas gauge. If the fuel level sensor, fuel gauge sending unit, and wiring are all functioning properly, then the gas gauge itself may be faulty. To replace the gas gauge, remove the instrument cluster from the dashboard and remove the old gas gauge. Install the new gas gauge and reinstall the instrument cluster.
5. Test the gas gauge. Once the new gas gauge is installed, test it by filling the fuel tank and then checking the gas gauge reading. The gas gauge should read full when the tank is full and should gradually decrease as the fuel level decreases. If the gas gauge is still not reading correctly, there may be another problem with the fuel system that needs to be addressed.
