The operation of the blower on gasoline-powered boats is a critical safety procedure designed to mitigate the risk of explosion. Gasoline fumes, being heavier than air, can accumulate in the lower compartments of a boat, particularly in the engine compartment. These fumes are highly flammable, and even a small spark can ignite them, leading to a potentially catastrophic event.
Employing the blower before starting the engine significantly reduces the chance of such an occurrence. The blower functions by forcing fresh air into the enclosed spaces, displacing any accumulated gasoline vapors and venting them overboard. This action dilutes the concentration of fumes to below their explosive limit, creating a safer environment for engine start-up. Historically, numerous boating accidents have been attributed to the failure to properly ventilate gasoline-powered boats, underscoring the significance of this simple yet vital safety practice.