A bilge blower is required on boats with which engine type?

A bilge blower is required on boats with which engine type?

• A. Outboard engines
• B. Electric motors
• C. Inboard gasoline engines
• D. Diesel engines

Answer: (C)

Preventing the buildup of gasoline vapors in the bilge is the key idea. Gasoline vapors are highly flammable and heavier than air, so they can collect in the bilge around an inboard engine. A bilge blower introduces fresh outside air into the bilge and vents it out, diluting any vapors before you start the engine or operate electrical equipment. This is why the requirement targets boats with inboard gasoline engines—the enclosed bilge space around that engine is where vapors pose the greatest ignition risk. Diesel-fueled boats have much less volatile vapors, and outboard engines aren’t housed in the same enclosed bilge space, so the same blower rule doesn’t apply in the same way.

Preventing the buildup of gasoline vapors in the bilge is the key idea. Gasoline vapors are highly flammable and heavier than air, so they can collect in the bilge around an inboard engine. A bilge blower introduces fresh outside air into the bilge and vents it out, diluting any vapors before you start the engine or operate electrical equipment. This is why the requirement targets boats with inboard gasoline engines—the enclosed bilge space around that engine is where vapors pose the greatest ignition risk. Diesel-fueled boats have much less volatile vapors, and outboard engines aren’t housed in the same enclosed bilge space, so the same blower rule doesn’t apply in the same way.