OUPV & 100-Ton Master · Uninspected Vessels
A backfire flame arrester is required on a vessel using gasoline for propulsion when the engine is:
- AAn outboard motor
- BAn inboard engine, on the carburetor air intake✓ Correct
- CA diesel engine
- DAn electric motor
Explanation
Inboard gasoline engines (other than outboards) must have a backfire flame arrester on the carburetor or air intake to prevent a backfire from igniting gasoline vapors in the engine space. Outboards and diesels are exempt.
Authority: 46 CFR 25.35; 33 CFR 183
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