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Why Can't You Say 'Fill It Up' When Refueling?

1 Answers

CarolineFitz

07/30/25 8:58am

The reasons why you shouldn't fill the fuel tank to the brim are as follows: 1. Safety hazard: When the fuel tank is completely filled, due to the principle of thermal expansion, if the vehicle is exposed to direct sunlight, the volume of gasoline will expand, causing increased internal pressure in the fuel tank. This may lead to deformation of the fuel tank. Additionally, gasoline may leak out through the tank's vent, which is why some vehicles may have gasoline near their rear wheels. 2. Performance impact: Overfilling the tank can easily block the fuel tank vent. When the vent is blocked, negative pressure builds up inside the tank, resulting in poor fuel supply or even complete fuel cutoff.

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