🔍 Key Concepts

• Diesel fuel injector function – how injectors spray fuel into the combustion chamber • Atomization vs. dribbling/leakage – fine mist versus a continuous trickle • Effects of too much fuel or poor spray pattern on combustion, smoke, and engine efficiency

💭 Think About

• What happens to the air–fuel mixture if fuel keeps leaking into the cylinder when it is NOT the correct injection moment? • Would a leak make the spray pattern better (finer mist) or worse (larger droplets and drips)? • How do large fuel droplets and over-fueling typically affect smoke, cylinder temperature, and how completely the fuel burns?

✅ Before You Answer

• Verify what proper atomization means in a diesel injector (fine, even mist at the correct time and pressure). • Think about whether a leak would increase or decrease fuel economy based on wasted/unburned fuel. • Recall the usual symptoms of a bad injector: smoke, rough running, and deposits – which choice best matches those symptoms?