🔍 Key Concepts

• Difference between how diesel engines and gasoline engines ignite fuel • Role of the fuel system in proper combustion • Which systems (lubrication, cooling, fuel, ignition) directly affect whether a cylinder fires or not

💭 Think About

• Ask yourself: In a diesel engine, what actually causes the fuel-air mixture to ignite—an electric spark, or something else? • Which of these systems, if it has air, water, dirt, or incorrect pressure, would most likely cause one cylinder to misfire over and over? • Which system is NOT normally present on a standard marine diesel engine?

✅ Before You Answer

• Confirm how diesel combustion starts (compression vs. spark). • Check which option might not even exist on a typical diesel engine. • Think about which system controls fuel delivery timing and quantity to each individual cylinder.