What is the reason why the fuel gauge does not change after refueling a car?

[Boromir]

The reason why the fuel gauge does not change after refueling a car: It may be caused by the oil float being stuck, aged, or damaged and leaking oil. In this case, the oil float cannot float on the gasoline, but instead remains suspended in the gasoline or sinks to the bottom. This can lead to inaccurate measurements or no response. The solution is to remove the fuel pump for inspection. How the fuel gauge works: There is a float ball (oil float) in the car's fuel tank. The float ball drives a sliding resistor, so as the fuel level in the tank changes, the potential at the measuring terminal also changes. The car's instrument processes this signal and displays it, with the corresponding display value representing the remaining fuel in the tank. The function of the fuel gauge: The fuel gauge primarily shows the amount of fuel to prevent the car from stalling on the road, reminding the driver to refuel in time. It uses a fuel level sensor to transmit signals, which is a damping-type sensor that relies on the up and down movement of the oil float to change the resistance and transmit signals.