It's the Law: Required Equipment

Backfire Flame Arrestors

Backfire flame arrestors are designed to prevent the ignition of gasoline vapors in case the engine backfires.

All powerboats (except outboards) that are fueled with gasoline must have an approved backfire flame arrestor on each carburetor.

Backfire flame arrestors must be:

• In good and serviceable condition and ...
• U.S. Coast Guard–approved (must comply with SAE J-1928 or UL 1111 standards).

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

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.

Mufflers

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

All vessel engines must have a factory-installed muffler or exhaust water manifold for noise reduction, or another effective muffling system.

You are prohibited from:

• Using cutouts
• Removing mufflers or muffler baffles
• Cutting or punching holes in mufflers
• Modifying the original muffler or muffling system in a way that increases the noise level