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All motorboats built after April 1940, with inboard-mounted gasoline engines (this includes inboards, inboard-outboards, and airboats) must have a backfire flame control device mounted securely to each carburetor.

  • Backfire flame arrestors must be:
    • In good and serviceable condition
    • U.S. Coast Guard–approved (must comply with SAE J-1928 or UL 1111 standards)
  • 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.
Backfire flame arrestor