What Causes Inaccurate Fuel Gauge Readings When Refueling Without Turning Off the Engine?

[LaFelicity]

If the fuel gauge of a new car suddenly drops to zero, it indicates a sensor issue, and you can directly request a replacement from the 4S store. For older cars, timely cleaning is necessary. Fuel Level Sensor Damage: Since gasoline contains many impurities, and the fuel level sensor is constantly immersed in it, over time it becomes contaminated, directly affecting the accuracy of the readings. If the fuel gauge suddenly rises, this is mainly due to the linkage between the fuel level sensor and the float getting stuck, preventing the float from moving up and down normally. As a result, the sensor does not register changes, causing the fuel gauge needle to remain fixed at a certain position. Fuel Pump Design: For many car models, the fuel gauge drops relatively slowly in the first half but accelerates after passing the middle mark. This is primarily related to the design of the fuel pump used to measure fuel levels, which cannot uniformly reflect changes in gasoline consumption. Achieving absolute uniform changes is difficult and cannot be easily altered through repairs or part replacements.