Is it necessary to turn off the engine when refueling a car?

[Valarie]

Cars must be turned off during refueling for the following reasons: 1. Gasoline is a flammable substance with volatile properties. When the concentration of gasoline molecules in the air reaches a certain level, even a small spark can potentially cause combustion or an explosion. 2. Sparks can occur at the exhaust pipe and electrical wiring interfaces. For safety reasons, all vehicles entering the station for refueling must turn off their engines. 3. When a car is running, the exhaust pipe continuously emits exhaust gases. On one hand, the exhaust pipe reaches very high temperatures, and on the other hand, sparks can be carried along with the exhaust gases, creating a safety hazard.