Regular maintenance required to keep the fuel system healthy - Replace the filter element, clean the pump body, and check the pump operating condition to ensure reliable fuel delivery and engine performance. Compatibility and fit - Benz Mercedes-Benz M-Class W163 series including ML320, ML350, ML500, ML430, ML55 - Years: 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 - Part number: 1634770801 KL438 Fuel Filter Material and construction - Made of high quality reliable metal material - Built to withstand engine bay conditions with durability and longevity Performance and engineering - Advanced manufacturing technology delivering high reliability and high performance - Supports clean fuel delivery to protect engine components and maintain optimal operation Use scenarios - Scenario 1: Routine service on a Mercedes-Benz M-Class W163 (ML320/ML350/ML500/ML430/ML55) during standard maintenance intervals to preserve fuel system efficiency. - Scenario 2: After experiencing symptoms of fuel contamination or degraded performance, such as reduced power or rough running, to restore proper fuel filtration. - Scenario 3: In a professional workshop performing preventive maintenance before long trips or high-mileage use, ensuring reliable fuel filtration and pump protection.