Question 67 RVR05 - Master of LT 100 GRT

The Correct Answer is B **Why option B ("fuel filters") is correct:** Maintaining good working order of high-precision components like fuel pumps and injectors critically depends on protecting them from contaminants (dirt, rust, sediment). These components have extremely tight tolerances, and even small abrasive particles can cause wear, scoring, and premature failure, leading to poor atomization and inefficient combustion. Fuel filters are specifically designed and positioned in the fuel system to remove these particulate contaminants, ensuring that only clean fuel reaches the pumps and injectors, thereby maintaining their proper functioning and extending their service life. **Why the other options are incorrect:** * **A) day tanks:** Day tanks store fuel for immediate use and provide a buffer. While they allow heavy contaminants and water to settle out by gravity (a benefit to the system), their primary function is storage and supply management, not the active, fine filtration required to protect injectors and pumps from damaging microscopic particles. * **C) an injector test stand:** An injector test stand is a piece of diagnostic equipment used to test, adjust, and calibrate injectors *after* they have been removed from the engine. It is a maintenance tool for repair and troubleshooting, not a component used within the operational fuel system to *prevent* wear and maintain ongoing good working order. * **D) fuel/water separators:** Fuel/water separators are essential for removing bulk water from the fuel, which is vital because water causes corrosion and damages components (especially injection pumps). However, while crucial, they are primarily focused on removing water. Fuel filters (often used alongside separators) are the specific components responsible for removing the fine particulate matter (dirt, sediment) that causes the abrasive wear leading to the loss of precision in pumps and injectors. The question focuses on maintaining "good working order," which necessitates preventing particulate wear, a function primarily performed by the fuel filters.