There are several types of fuel level sensors, but they all generally work by measuring the height or depth of the fuel in the tank. Common methods include:
* Float-type sensors: These are the most common type. A float, attached to a potentiometer or other variable resistor, rises and falls with the fuel level. The resistance changes as the float moves, sending a signal to the gauge indicating the fuel level.
* Capacitive sensors: These sensors use changes in capacitance to measure the fuel level. The fuel itself acts as a dielectric in a capacitor, and the change in capacitance reflects the level.
* Ultrasonic sensors: These use sound waves to measure the distance to the fuel surface, thereby determining the fuel level.
Regardless of the type, the sensor's output signal is converted into a reading (typically a percentage of full capacity) that's displayed on the fuel gauge, giving the driver an indication of how much fuel is left in the tank. A faulty fuel level sensor can lead to inaccurate fuel gauge readings.
