- Fuel pump sensor: The fuel pump sensor is responsible for sending a signal to the fuel gauge indicating how much fuel is in the tank. If the sensor is faulty, it may send an incorrect signal to the gauge, causing it to show a full tank when it's empty or vice versa.
- Fuel tank float: The fuel tank float is a device located inside the fuel tank that rises and falls with the fuel level. As the float moves, it sends a signal to the fuel gauge indicating how much fuel is in the tank. If the float is stuck or damaged, it may cause the fuel gauge to show an incorrect reading.
- Fuel gauge: The fuel gauge itself may be faulty and not correctly process the signals from the fuel pump sensor or the fuel tank float. This could cause the gauge to show an incorrect reading, such as a full tank when the tank is empty.
To diagnose the exact cause of the problem, you may need to inspect the fuel pump sensor, the fuel tank float, and the fuel gauge. If any of these components are faulty, they will need to be replaced.
