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All powerboats (except outboards) fueled with gasoline must have an approved backfire flame control device securely attached to each carburetor.

Backfire flame arrestor

Backfire flame arrestors are designed to prevent the ignition of gasoline vapors in case the engine backfires. To be acceptable, backfire flame arrestors must be:

  • Securely attached to the air intake with a flame-tight connection and ...
  • In proper working order and ...
  • U.S. Coast Guard–approved or comply with either SAE J1928 or UL1111 and ...
  • Marked to indicate the approval or compliance.