What is the reason for no change in the fuel gauge after refueling?
1 Answers
The reason for no change in the fuel gauge after refueling is: the fuel float is stuck or aged and damaged, allowing fuel to enter. The fuel float cannot float on the gasoline and may either suspend in the gasoline or sink to the bottom, leading to inaccurate measurements or no response. The solution is to dismantle the fuel pump for inspection. The working principle of the fuel gauge is: there is a float ball (fuel float) in the car's fuel tank, which drives a sliding resistor. As the fuel level in the tank changes, the potential at the measurement terminal also changes. The car's instrument processes this signal for display, and the corresponding displayed value is the remaining fuel in the tank. The height of the fuel surface and the actual fuel quantity in the tank do not have a simple linear relationship. For example, if a fully fueled car is used for a period, the fuel surface height in the tank drops by half, and the float also drops by half, which would show as the pointer on the fuel gauge dropping by half. However, due to the irregular shape of the fuel tank, the car actually consumes more than half of the fuel.