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What is the reason for the intermittent malfunction of the Passat fuel gauge?

1 Answers

GriffinLee

07/29/25 5:14pm

The Passat fuel gauge needle malfunction is due to damage to the fuel level sensor inside the fuel tank. Replacing the fuel level sensor inside the fuel tank can resolve this issue. The fuel level 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, and then converts this change into a current variation. Below is more information about the fuel level sensor: 1. 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 with precise linear and temperature compensation, outputting a 4-20mA standard signal to the display instrument. 2. Applicable Scenarios: Compact industrial-grade fuel level sensors are suitable for measuring low-viscosity oil under 5MPA and temperatures below 200℃, and can support various communication protocols. Automotive-specific fuel level sensors are suitable for measuring various fuel oils under normal temperature and pressure, with adjustable output damping times of 30-180s, and can support 485 communication.

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