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This is because gas is a liquid and moves around in the tank, when you accelerate the fuel moves to the rear of the tank, moving the float on the sending unit, making the gauge go up. In turn if you brake hard, the gauge will go down as the fuel will move away from the sending unit. They do put baffles in the tank to keep this from being to bad, but it does still happen on most vehicles.

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13y ago

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