Why does the fuel gauge show not full after refueling?

1 Answers
SanBeckett
07/29/25 7:09pm
The reasons why the fuel gauge shows not full after refueling are as follows: 1. When refueling, the air rapidly discharged from the fuel tank creates a certain air pressure on the sensing device of the fuel nozzle. If the air pressure is slightly high, the highly sensitive fuel nozzle may mistakenly treat the discharged air as gasoline, triggering the auto-stop mechanism (jump gun phenomenon) when it thinks the tank is full, but in reality, it's not. 2. The fuel level sensor is dirty, causing detection errors. In this case, simply wipe it with a cloth, being careful not to damage the black surface layer of the sensor. The principle of how a car detects whether the fuel tank is full: There is a float ball in the fuel tank that drives a sliding resistor. As the fuel level changes, the potential at the measurement terminal also changes. The car instrument uses this signal for detection display, and the corresponding display value is the remaining fuel quantity in the tank.
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