Under US Coast Guard rules, which item is not required on a PWC?

• A. Engine compartment blower
• B. Backfire flame arrestor
• C. Natural ventilation
• D. Muffled exhaust system

Answer: (A)

PWCs are designed with safety measures to prevent fuel vapors from accumulating and to keep exhaust noise down. The engine compartment blower is not required because these craft don’t have a large enclosed engine room that needs forced air; ventilation is achieved through the engine bay design and often relies on natural ventilation. In contrast, a backfire flame arrester is required on gasoline engines with carburetors to prevent ignition of vapors in the intake, natural ventilation is required to vent fumes, and a muffled exhaust system is needed to reduce noise. So the item not required by USCG rules on a PWC is the engine compartment blower.