True or False: It is safe to fill the gas tank while the engine is running.

Filling the gas tank while the engine is running is considered unsafe and is therefore false. The primary reason for this is the risk of fire or explosion. Gasoline is highly flammable, and any spark from the running engine can ignite the fuel vapors, leading to a dangerous situation. Furthermore, many safety regulations and fuel station policies explicitly prohibit refueling a vehicle while the engine is operational to mitigate such risks.

Additionally, it is important to ensure that all safety measures are followed when handling flammable materials. This includes turning off the engine before refueling, which is a standard practice to provide an additional layer of safety.

Thus, the assertion that one can safely fill the gas tank while the engine is running is incorrect, making the correct response "false."