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It's the Law

Backfire Flame Arrestors

Backfire flame arrestor
Backfire flame arrestor

Because vessel engines may backfire, all powerboats (except outboards) that are fueled with gasoline must have a USCG–approved (comply with SAE J–1928 or UL 1111 standards) backfire flame arrestor on each carburetor.

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