What is one important safety action when fueling a boat?

Securing the boat to the fueling dock and turning off the engine is crucial for safety during the fueling process. This action minimizes the risk of fire or explosion caused by fuel vapors that can ignite if the engine is running. Keeping the engine off ensures that there are no potential sources of ignition and helps maintain a clear and safe area for fueling. Additionally, securing the boat prevents it from moving away from the dock, which allows for a controlled and safe fueling environment.

The other options involve actions that could significantly increase risks. Leaving the engine running for ventilation can create dangerous conditions, as fuel vapors are highly flammable. Filling the gas tank to maximum capacity can lead to spillage and overfilling, which can also pose a fire hazard. Allowing passengers to remain onboard can distract the person fueling the boat and can create chaos in case of an emergency. Thus, turning off the engine and securing the boat are essential steps to ensure safe fueling practices.