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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 and fuel-injected engines) that are fueled with gasoline must have a USCG–approved (must comply with SAE J-1928 or UL 1111 standards) backfire flame arrestor on each carburetor.

Backfire flame arrestors must be in good, serviceable condition and be mounted with metal-to-metal contact.

It is illegal to have any holes in the mesh of the backfire flame arrestor.

Periodically clean the flame arrestor(s) and check for any damage.