Why does the fuel gauge indicator light stay on after filling up the car with gas?
1 Answers
After filling up the fuel tank, the fuel tank float rises so high that the contacts and sliding piece of the fuel level sensor cannot reach the edge position, sometimes even disconnecting. This results in a high resistance, similar to the situation when the fuel is low, causing the fuel warning light to activate and stay on. The fuel gauge indicator light staying on is caused by the following reasons: 1. Fuel level sensor malfunction: The fuel level sensor detects the position (height) of fuel in the container by measuring the change in capacitance between the sensor casing and the sensing electrode when fuel enters, converting this change into a current change. If possible, you can replace the fuel level sensor at a repair shop. 2. Wiring fault: When there is a short circuit or open circuit in the wiring, the information from the fuel level sensor cannot be read, resulting in the indicator light staying on.