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It's the Law

Backfire Flame Arrestors

Backfire flame arrestor
Backfire flame arrestor

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.