🔍 Key Concepts

• Diesel engine shutdown methods when controls fail • Difference between fuel system and electrical ignition on a diesel • What actually makes a diesel engine stop running (air, fuel, or load)

💭 Think About

• Ask yourself: Does a diesel engine rely on an ignition system like a gasoline engine, or does it run differently? • Which option acts fastest directly on what the engine needs to keep running? • Would adding mechanical load alone reliably stop an engine that is being over-fueled and overspeeding?

✅ Before You Answer

• Remember that most small marine diesel engines do not have spark plugs or a conventional ignition system • Identify which choice directly and immediately cuts off fuel to the engine, not just the tank in general • Consider which action can be done instantly in an emergency to prevent overspeed damage