On gasoline powered boats when should the blower?

The blower on gasoline-powered boats should be operated for at least four minutes before starting the engine or when re-entering the cabin after being away from the boat. This helps to ventilate the engine compartment and remove any potentially explosive fuel vapors. Additionally, it's important to use the blower whenever the boat has been fueled or if there are any signs of fuel leaks. Regular use of the blower enhances safety by reducing the risk of fire or explosion.