It's the Law: Required Equipment

• Ventilation Systems
• Backfire Flame Arrestors
• Mufflers

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 lifethreatening 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

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 and check for damage.

Mufflers

All vessel engines must be equipped with an effective muffling device or underwater exhaust. Vessel operators may not hear sound signals or voices if the engine is not adequately muffled.

• The noise level of any motorized vessel measured at a distance of 50 feet or more from the vessel must not exceed 82 decibels in normal operating environments.
• The use of cutouts is prohibited.