🔍 Key Concepts

• fuel injection system components in a diesel engine (pumps, injectors, nozzles) • the purpose of filters and strainers in a fuel system • how abrasive particles in fuel affect close‑tolerance moving parts

💭 Think About

• Which part of the fuel system has the tightest clearances and would be most vulnerable to small particles of dirt? • Think about the job of a strainer or filter—is it more likely to be damaged by dirt, or to protect other components from it? • Would dirt in the fuel reasonably cause the engine to run away (over speed) or run cooler, or is it more likely to interfere with precise fuel delivery?

✅ Before You Answer

• Identify which option refers to a component with very fine clearances and high pressure fuel. • Eliminate any choices that describe effects not directly related to fuel contamination (like cooling or speed control). • Remember that strainers are designed to catch dirt; consider what they are intended to protect downstream.