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What is the reason why the fuel gauge of Mercedes-Benz C does not drop?

2 Answers

DelJulianna

07/28/25 6:07pm

The reason why the fuel gauge of Mercedes-Benz C does not drop is that the float in the fuel tank is stuck, and it can be adjusted and repaired. Do not overfill the fuel tank: Overfilling the fuel tank can easily block the vent hole of the fuel tank. Once the vent hole is blocked, the air pressure inside the fuel tank will be lower than normal, causing poor fuel supply or even no fuel supply. Overfilling the fuel tank also increases the weight of the car, thereby increasing fuel consumption. The gasoline may also deteriorate, posing a safety hazard to the car. Try to avoid waiting for the warning to refuel: When driving, always pay attention to the fuel gauge. When the pointer shows that there is only a quarter of the fuel left, you should refuel. If the fuel tank is empty for too long, the temperature difference between the inside and outside will be large, and moisture is likely to form inside the fuel tank, which will corrode the fuel tank, affect the fuel quality, and increase the burden on the engine.

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AllisonDella

08/11/25 11:58pm

I've been driving a Mercedes-Benz C-Class for five years, and I've also encountered the issue where the fuel gauge doesn't drop. The main cause is the fuel level sensor in the tank getting stuck. This sensor uses a float to detect fuel levels, and after refueling, it might stick to the tank wall, showing a full reading continuously. Another possibility is a malfunctioning dashboard or a blown fuse, with circuit aging causing signal interruptions. Don't underestimate this issue—suddenly running out of fuel on the highway is extremely dangerous. When I discovered this, I went straight to the dealership for a check-up. The technician used a computer diagnostic tool to identify the problem and fixed it by replacing a small part. I recommend not filling the tank too full to reduce the risk of sticking and having the technician test the fuel gauge system during regular maintenance to avoid major issues. Mercedes-Benz cars are high-quality, but their electronic components also require maintenance.

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