🔍 Key Concepts

• diesel fuel injection system components and what directly affects nozzle operation • difference between cause of faulty nozzle operation vs. a result/symptom of it • how fuel cleanliness and spray pattern quality relate to nozzle performance

💭 Think About

• Which option describes something that physically acts on, or passes through, the nozzle itself during normal operation? • Which of these is more likely to be a symptom or consequence somewhere else in the engine, rather than a direct cause at the nozzle? • Think about what will most immediately change how fuel leaves the nozzle and enters the cylinder.

✅ Before You Answer

• Identify which choices directly interact with the fuel nozzle and its internal passages. • Ask: Which factor would most likely plug, erode, or otherwise interfere with the nozzle orifices? • Separate general engine condition issues (like lube oil pressure) from issues specific to the fuel path and spray formation.