Mercedes-Benz GL550 stalling issue with fuel gauge reading half despite replacing fuel level sensors on Mercedes-Benz GL550

Some Mercedes-Benz GL550 owners report experiencing stalling issues along with inaccurate fuel gauge readings, even after replacing fuel level sensors. These problems may stem from a faulty sending unit in the tank, corroded or loose wiring connections, or a malfunctioning actuator at the dashboard fuel gauge. Furthermore, some owners may not realize that the gas gauge operates independently of the sensors, as it relies on a direct connection to the fuel pump control module, with the fuel level information transmitted to the instrument cluster via CAN. Additionally, it’s important to note that onboard computers that measure fuel consumption do not depend solely on in-tank sensors, as they utilize separate metering devices. To address these concerns, some owners find it helpful to fill the gas tank, clear any error codes, and drive the vehicle to reset the monitors before taking it for a smog check, as the Powertrain Control Module (PCM) monitors the fuel level input circuit for electrical failures. Further investigation into the sending unit, wiring connections, and fuel gauge actuator is recommended to determine the root cause of these issues.