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Why is the fuel gauge still inaccurate after replacing the oil float?

1 Answers

AustinAnn

07/24/25 4:25pm

If the fuel gauge remains inaccurate after replacing the oil float, it may be due to a damaged sensor. Here are some additional details: 1. Damaged sensor: A faulty vehicle sensor can prevent the central control system from receiving relevant vehicle information, making it difficult for the driver to monitor the car's condition in real time. 2. How the oil float works: The oil float relies on buoyancy to stay on the surface of the fuel. The position of the float indicates the liquid level, and knowing the liquid level height allows the volume of fuel in the tank to be calculated based on the tank's shape. Essentially, it functions as a sliding resistor. As the fuel level changes, the position of the float changes, altering the resistance of the sliding resistor connected to the float. The computer sends a voltage to the sliding resistor and measures the voltage drop to estimate the fuel level, which is then displayed on the car's dashboard. In reality, the float in the fuel tank is a sliding variable resistor. Its movement changes the resistance in the circuit, which is then reflected by the fuel gauge needle on the dashboard.

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