Why Does the Car's Fuel Gauge Show Increasing Fuel?

[LaJocelyn]

The fuel level sensor inside the fuel tank is malfunctioning. It is necessary to check the fuel level sensor and replace it if needed to resolve the issue. Problems caused by the gauge itself are relatively rare. A sudden rise in the fuel gauge reading is mainly due to the linkage between the fuel level sensor and the float being stuck, preventing the float from moving up and down normally. This causes the sensor to remain unchanged, resulting in the fuel gauge needle staying at the full position. Below is an introduction to fuel sensor-related knowledge: 1. Definition: This sensor detects the position (height) of fuel in a container by measuring the change in capacitance between the sensor housing and the sensing electrode caused by the fuel entering the container, converting this change into a current variation. 2. Working Principle: The sensing part of a capacitive fuel level sensor is a coaxial container. When fuel enters the container, it causes a change in capacitance between the sensor housing and the sensing electrode. This change is converted by the circuit and undergoes precise linear and temperature compensation, outputting a 4-20mA standard signal to the display gauge.