Which statement about cleaning and inspecting the FO strainer is correct?

• A. Clean and inspect when the system is not pressurized
• B. Clean and inspect during full operation
• C. Clean weekly regardless of pressure
• D. Never clean

Answer: (A)

Cleaning and inspecting the FO strainer should be done when the system is depressurized to ensure safe access and an accurate check of the screen. When the line is not under pressure, you can safely open the housing, remove the screen, look for tears, holes, or excessive wear, and remove accumulated debris without fuel spraying or sudden release. This prevents injuries and fuel spills and allows you to verify that the strainer elements and gaskets seal properly before reassembly. Cleaning during full operation or while pressurized would be dangerous and could hide damage or allow contaminants to enter the fuel system, while never cleaning would let debris pass through to pumps and injectors.