It's the Law: Required Equipment

• Mufflers
• Ventilation Systems
• Backfire Flame Arrestors
• Emergency Ignition Safety Switch

Mufflers

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

Ventilation Systems

The purpose of ventilation systems is to avoid explosions by removing flammable gases.

• 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 PWC), open the engine compartment and sniff for 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 a U.S. Coast Guard—approved (or comply with SAE J-1928 or UL 1111 standards) backfire flame arrestor on each carburetor.
• Backfire flame arrestors must be in good and serviceable condition. Periodically clean the flame arrestor and check for damage.

Emergency Ignition Safety Switch

An emergency ignition safety switch is required to be operating and attached to the operator’s person, clothing, or PFD by a lanyard on any motorboat less than 26 feet long that:

• Is powered by an outboard motor in excess of 10 horsepower and …
• Is steered by a hand tiller or steering arm attached to the motor and …
• Has or is designed to have a safety switch.