🔍 Key Concepts
• Diesel engine starting requirements: correct fuel quantity, correct injection timing, adequate compression, and proper atomization
• Effects of air in a fuel system versus changes in pressure or viscosity
• What conditions would actually PREVENT combustion, not just make the engine run poorly
💭 Think About
• Look at each choice and ask: would this condition stop the engine from firing at all, or just make it run rough once running?
• For fuel injection, what happens if the injector is not delivering a solid, continuous spray of fuel into the cylinder during cranking?
• Between pressure, viscosity, air in fuel, and starting air pressure, which one most directly interrupts fuel delivery during starting?
✅ Before You Answer
• Identify which choice would cause no effective fuel injection into the cylinders during cranking
• Eliminate any options that would more likely cause mechanical damage or abnormal running, rather than a simple failure to start
• Focus on the option that introduces a compressible medium into a system that is supposed to be solid, incompressible fuel for proper injector operation