It's the Law: Required Equipment

Ventilation Systems

The purpose of ventilation systems is to avoid explosions by removing flammable gases. Properly installed ventilation systems greatly reduce the chance of a life-threatening explosion.

• All gasoline-powered vessels, constructed in a way that would entrap fumes, must have at least two ventilation ducts fitted with cowls to remove the fumes.
• If your vessel is equipped with a power ventilation system, turn it on for at least four minutes both after fueling and before starting your engine.
• If your vessel is not equipped with a power ventilation system (for example, a personal watercraft), open the engine compartment and sniff for gasoline fumes before starting the engine.
  

Backfire Flame Arrestors

Because boat engines may backfire, all powerboats (except outboards) that are fueled with gasoline must have a U.S. Coast Guard–approved backfire flame arrestor on each carburetor (must comply with SAE J-1928 or UL 1111 standards).

Periodically clean the flame arrestor(s) and check for any damage.

Mufflers

Vessel operators may not hear sound signals or voices if the engine is not adequately muffled.

• All vessels equipped with an engine must have a factory-type muffler or exhaust water manifold installed on the engine or another effective muffling system for noise reduction purposes.
• The use of cutouts is prohibited except for vessels participating in permitted marine events.