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Because watercraft engines may backfire, all powerboats (except outboards) that are fueled with petrol must have actually an approved backfire flame arrestor on each carburetor. Backfire fire arrestors room designed to protect against the ignition of gasoline vapors in instance the engine backfires.

You are watching: Eq-21 which of the following is true of a carburetor backfire flame arrestor?

Backfire fire arrestors must be: In an excellent and serviceable condition. USCG–approved (must comply with SAE J-1928 or UL 1111 standards). periodically clean the flame arrestor(s) and also check for any damage.
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Glossary


backfire To undergo an explosion of prematurely ignited fuel or the unburned exhaust gases in an internal combustion engine
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