On gasoline powered boats, when should the blower be operated?

Operating the blower before starting the engine and after refueling is crucial for safety on gasoline-powered boats. This practice ensures that any potential gasoline vapors, which are highly flammable, are removed from the engine compartment. Gasoline vapors can accumulate and pose a significant risk of explosion if ignited when the engine is started. By running the blower for several minutes prior to starting the engine, the vapors are dissipated, creating a safer environment for starting the engine.

This procedure is especially important after refueling, as this is when the risk of vapor accumulation is highest due to the introduction of fresh fuel into the tank and the surrounding areas. It's a preventive measure that enhances safety on board and minimizes the risk of fire or explosions associated with gasoline vapors.