Which device is used to prevent backfire from the exhaust on a PWC?

Which device is used to prevent backfire from the exhaust on a PWC?

• A. Backfire flame arrestor
• B. Natural ventilation
• C. Muffled exhaust system
• D. Should come from manufacturer with required equipment

Answer: (A)

Backfire flame arrestor is used to stop flames from traveling back through the exhaust and igniting the air–fuel mixture in the carburetor or intake. It consists of a mesh or screen that interrupts and cools any flame front, so a backfire cannot ignite vapors inside the engine. This safety device is placed on the intake side to prevent fires and engine ignition from exhaust backfires. Other options don’t address this specific risk: natural ventilation won’t stop a flame from traveling back, a muffled exhaust reduces noise but not ignition risk, and manufacturer-required equipment isn’t the device itself that prevents backfire.

Backfire flame arrestor is used to stop flames from traveling back through the exhaust and igniting the air–fuel mixture in the carburetor or intake. It consists of a mesh or screen that interrupts and cools any flame front, so a backfire cannot ignite vapors inside the engine. This safety device is placed on the intake side to prevent fires and engine ignition from exhaust backfires. Other options don’t address this specific risk: natural ventilation won’t stop a flame from traveling back, a muffled exhaust reduces noise but not ignition risk, and manufacturer-required equipment isn’t the device itself that prevents backfire.