How to Check the Car Fuel Gauge?

[RowanMarie]

Car fuel gauge reading method: Generally, there are two English letters on the fuel gauge - E represents empty (no fuel), and F represents full. The fuel gauge contains two coils located on the F and E sides respectively. The sensor is a variable resistor controlled by float height. The resistance change determines the magnetic field strength of the two coils, which in turn determines the deflection direction of the needle. Some temperature gauges and fuel gauges use indicator lights instead - the temperature warning light indicates high engine temperature, while the fuel warning light serves as an auxiliary reminder when fuel is running low. The fuel level display works via a float in the fuel tank connected to a metal rod. This principle is similar to a toilet water tank mechanism. The end of the float-connected metal rod attaches to a movable contact point on a variable resistor. The positional changes of the float on the fuel surface alter the resistor's contact position through the metal rod. This variable resistor connects to the car's fuel gauge, where the needle movement is controlled by the amount of current passing through the variable resistor.