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The core of fuel system maintenance—fuel-water separators
2025-11-14
Water and impurities in diesel fuel pose a major threat to components of the fuel system, such as high-pressure oil pumps and injectors. The primary function of an oil-water separator is to filter out moisture and larger particulate contaminants from the fuel. Before starting work each day, you should unscrew the drain valve at the bottom of the separator to remove any accumulated water until clear fuel begins to flow. Additionally, the separator’s entire filter element should be replaced periodically, either according to the manufacturer’s recommended replacement schedule or based on operating hours. Neglecting this maintenance step could allow moisture to enter the common-rail system, triggering warning signals from the electronic control unit, causing insufficient engine power, and even leading to difficult engine starts—issues whose repair costs can easily exceed the price of a single filter element.
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