What is the principle of the fuel tank float and what are the manifestations of its faults?

1 Answers
Sidney
07/29/25 10:15pm
The working principle of the fuel float is: 1. The fuel float floats on the surface of the fuel by buoyancy, and the position of the float indicates the liquid level. By knowing the height of the liquid level and the shape of the fuel tank, the volume of fuel inside the tank can be determined; 2. It acts as a sliding resistor. Different fuel levels result in different positions of the float, which in turn changes the resistance of the sliding resistor connected to the float. The computer supplies a voltage to the sliding resistor, and after measuring the voltage drop, it estimates the fuel level and displays the data on the car's dashboard; 3. The actual float in the fuel tank is a sliding variable resistor. The movement of the float changes the resistance in the circuit, which is then reflected by the fuel gauge needle on the dashboard. The following are the manifestations and solutions for fuel float faults: 1. The fuel gauge suddenly drops to zero. This indicates an issue with the vehicle's fuel level sensor, commonly known as the fuel float. The cause is usually dirt or contamination on the sensor that hasn't been cleaned in time; the solution is to clean the fuel level sensor. 2. If the gasoline contains a large amount of impurities, the fuel level sensor inside the tank, being submerged in the fuel, can become contaminated over time, directly affecting the accuracy of the readings. The solution is to clean or replace the fuel float.
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