Where is a BFA typically attached?

• A. To the air intake, usually on top of the Carburetor
• B. On the exhaust manifold
• C. To the spark plug
• D. On the fuel line

Answer: (A)

Backfire flame arresters are placed on the air intake to stop any flame that travels back from the combustion chamber from reaching the carburetor. Placing it on top of the carburetor’s air intake intercepts flames before they can ignite the fuel–air mixture, preventing a potential fire. Attaching it to the exhaust manifold, spark plug, or fuel line wouldn’t stop backfires from entering the carburetor or wouldn’t serve the purpose of preventing ignition at the intake.