When must you use a Power ventilation?

• A. Only after refueling.
• B. Never.
• C. When refueling, use 4 minutes before you start the boat, to get rid of gases to avoid an explosion.
• D. Only while underway at high speed.

Answer: (C)

Power ventilation is used to purge gasoline vapors from the boat to reduce the risk of ignition. Gasoline vapors can accumulate in the bilge and other spaces during fueling, and they’re easily ignited by a spark or heat source. Running the power ventilation after fueling and giving it about 4 minutes before starting the engine ensures most of those vapors are expelled and fresh air replaces them. That waiting period lowers the chance of an explosion when the engine starts. It isn’t about starting only at high speed or never using ventilation; it’s specifically about venting after fueling and before engine start to keep the boat safe.