In a car's fuel gauge, 'F' stands for full, and 'E' indicates low fuel level. For an analog fuel gauge, when the needle points to 'F', it means the fuel tank is full. The closer the needle is to 'E', the lower the fuel level, meaning there is less fuel in the tank. 'F' represents full fuel, short for 'FULL'. On a car's fuel gauge, 'F' is derived from the English word 'FULL', indicating a full tank, while 'E' stands for 'Empty', meaning low fuel. Precautions for refueling a car: Avoid overfilling the tank: If the tank is overfilled with gasoline, the high summer temperatures and the heat generated by the car itself can cause the gasoline to expand. To prevent the fuel tank from being damaged due to the expansion of gasoline, there is a vent hole at the top. If the tank is overfilled, gasoline may overflow through the vent hole, which could lead to spontaneous combustion if exposed to an open flame, with potentially catastrophic consequences. Additionally, gasoline overflowing through the vent hole may drip onto the car body, causing some corrosion. Avoid waiting until the fuel light comes on to refuel: While driving, always pay attention to the fuel gauge. When the needle indicates that only a quarter of the fuel remains, it's time to refuel. It's best not to wait until the fuel light comes on before refueling. Modern cars use electric fuel pumps that rely on gasoline for lubrication and cooling. Frequently waiting until the fuel light comes on to refuel can prevent the fuel pump from receiving proper lubrication and cooling, ultimately reducing its lifespan. Choose the right time to refuel: Avoid refueling at noon. Due to thermal expansion, the volume of gasoline increases with rising temperatures and decreases when temperatures drop. Since refueling is billed by volume, to save money, it's better to refuel in the early morning or evening.
