🔍 Key Concepts

• Preventive maintenance practices for diesel fuel systems • The role of fuel conditioning vs. component testing • How contaminants affect pumps and injectors over time

💭 Think About

• Ask which option works continuously during normal operation to protect both pumps and injectors, not just during troubleshooting or storage. • Consider which choice directly reduces wear and damage from particles in the fuel passing through tight clearances in pumps and injectors. • Think about what equipment is normally installed in-line in the fuel system versus equipment used only in a shop or as a separate device.

✅ Before You Answer

• Identify which device’s primary function is to remove solid contaminants right before fuel reaches the pumps/injectors. • Eliminate options that are mainly for storage, water removal, or testing, rather than ongoing protection in service. • Verify which item would be found as a standard part of the engine’s fuel supply system, operating whenever the engine runs.