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Does the fuel-water separator need to be refueled?

1 Answers

McEmilio

07/30/25 8:09am

The fuel-water separator does not require refueling. Generally used in diesel vehicles, the fuel-water separator is installed near the fuel tank to separate water from diesel. Diesel flows from the fuel tank through the fuel-water separator to the diesel filter before entering the diesel pump and high-pressure fuel pump. During this process, the fuel-water separator does not need additional fuel to maintain normal operation. The working principle of the fuel-water separator is based on the density difference between water and fuel, utilizing the Earth's gravitational field to induce relative movement—oil rises while water sinks—thus achieving the purpose of oil-water separation. Fuel-water separators can be categorized by usage into industrial-grade, commercial, and household types, primarily applied in petrochemicals, fuel-powered vehicles, and wastewater treatment. Automotive fuel-water separators can preheat fuel to prevent wax formation and filter impurities. As a type of fuel filter, the main function of an automotive fuel-water separator is to remove water from diesel, reducing injector failures and extending engine lifespan.

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