Will the fuel in the car's tank evaporate if left for a day?

1 Answers
TravisMarie
07/30/25 10:57am
Gasoline in the fuel tank will evaporate, but the amount of evaporation is minimal. The reasons for evaporation are as follows: 1. If you look at the fuel gauge, it is only a 'qualitative' gauge. The scale can only indicate whether there is more or less fuel, but it does not show the actual fuel quantity. The fuel gauge may show slight variations due to changes in the car's voltage. 2. If the car is parked for an extended period, gasoline will evaporate because the fuel tank is connected to the atmosphere through valves. When the vapor pressure in the tank is high, some vapor is expelled; when the vapor pressure is low, some air is drawn in. This repeated exchange results in a reduction of gasoline evaporation. 3. Thermal expansion and contraction: Right after parking, the gasoline temperature is higher, and its volume is larger. After being parked for a while, the temperature drops, the volume contracts, and the fuel level decreases.
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