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It's the Law

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).
Backfire flame arrestor
Backfire flame arrestor

Periodically clean the flame arrestor(s) 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.