The Boater's Guide of New Hampshire: A Handbook of Boating Laws and Responsibilities
The Official Boating Handbook of the New Hampshire Marine Patrol - Web Version
Table of Contents
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.