Why doesn't the fuel gauge display after refueling?
1 Answers
The abnormal display of the car fuel gauge is usually caused by a malfunction of the fuel float (fuel level sensor). The fuel gauge detects the fuel level through the float, and if the detection signal is distorted, such problems may occur. Some fuel level displays are controlled by the car's computer, and if the computer signal malfunctions, inaccurate display may also occur, although this probability is very low. Additional information: 1. Inside the car fuel tank, a float is connected to a metal rod, operating on the same basic principle as the float in a household toilet water tank. When the water level drops, the position of the float also decreases, which in turn drives a linkage to open the water inlet valve, allowing water to flow in. As the water level rises, the float position also rises, and once it reaches a certain level, the linkage will close the water inlet valve. 2. The measurement unit of the fuel gauge also employs this simple, straightforward, and practical method. However, the end of the metal rod connected to the float is linked to a variable resistor via a movable contact. The position of the float on the fuel surface in the tank, whether high or low, changes the position of the wiper on the variable resistor via the metal rod. This variable resistor is then connected to the car's fuel gauge, and the movement of the gauge pointer is controlled by the amount of current passing through the variable resistor.
