Why does the fuel gauge show less than full after refueling?

1 Answers
MacNova
07/30/25 1:47am
Why does the fuel gauge show less than full after refueling? The reason is that the fuel gauge float is damaged. The following is an introduction to how to check the car fuel gauge and the principle of the fuel gauge: How to check the car fuel gauge: Generally, there are two English letters on the fuel gauge, E stands for empty, and F stands for full. There are two coils inside the fuel gauge, located on the F and E sides respectively. The sensor is a variable resistor controlled by the float height. The change in resistance determines the strength of the magnetic field of the two coils, which in turn determines the deflection direction of the pointer. How the fuel gauge works: There is a float in the car fuel tank, which drives a sliding resistor. As the fuel level in the tank changes, the potential at the measuring terminal also changes. The car instrument processes this signal and displays it, and the corresponding displayed value is the remaining fuel in the tank.
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