What safety feature must be installed on top of a carburetor?

The requirement for a backfire flame arrestor to be installed on top of a carburetor is critical for ensuring safety in marine engines. This device acts as a safety mechanism designed to prevent flames from igniting the fuel vapors and potentially causing a fire or explosion in the engine compartment. During operation, if a backfire occurs, the flame arrestor suppresses the flames from traveling back into the carburetor and fuel system, thereby reducing the risk of serious accidents.

The installation of a backfire flame arrestor is particularly important in marine environments where fuel vapors can easily accumulate and become highly flammable. Regulations and best practices often stipulate this safety feature as a standard requirement for engines on recreational vessels to protect both the crew and the vessel from fire hazards.