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 one of the following:
  • A backfire flame arrestor on each carburetor. Arrestors must be USCG—approved (must comply with SAE J-1928 or UL 1111 standards) and marked accordingly.
  • An arrangement of the carburetor or engine air induction system that safely disperses any flames from a backfire to the atmosphere outside the vessel.
• Paper or automotive filters are not USCG—approved and are dangerous to use.

Ventilation Systems

The purpose of ventilation systems is to remove flammable gases, greatly reducing 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 the 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 and Noise Limits

• All vessel engines must have an effective, permanently installed muffling system that cannot be bypassed.
  • Vessels built before January 1, 1995, must not exceed 90 dB(A) using the stationary test.
  • Vessels built on or after January 1, 1995, must not exceed 88 dB(A) using the stationary test.
  • While operating on lakes and rivers wider than 500 feet, it is unlawful to exceed 75 dB(A) as measured from shore.
• Contact your local sheriff's department for a free screening of your vessel's noise.