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.
• Regularly check the ventilation ducts for obstructions, such as bird's nests. Make sure you can feel air coming out of the cowl when the ventilation system is turned on.

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. The elements must be clean, and the grids must be tight enough to prevent flames from passing through.
• Automotive-type air cleaners are not adequate for marine use and are not permitted.

Mufflers and Noise Level Limits

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

• All vessel engines must be equipped with an efficient muffler, underwater exhaust, or other effective muffling device that prevents excessive or unusual noise.
• A vessel operating on Arizona’s public waters must not exceed any of the following noise levels.
  • A noise level of 86 dB(A) when the sound level is measured at 50 feet or more from the vessel
  • For an engine manufactured before January 1, 1993, a noise level of 90 dB(A) when the stationary sound level test (SAEJ2005) is performed
  • For an engine manufactured on or after January 1, 1993, a noise level of 88 dB(A) when the stationary sound level test (SAEJ2005) is performed
  • A noise level of 75 dB(A) when the shoreline sound level test (SAEJ1970) is performed