{"product_id":"fuel-water-separator-filter-fs20121-for-cummins-l9-b6-7-v-qsb-qsl-engine","title":"Fuel Water Separator Filter FS20121 for Cummins L9 B6.7 V QSB QSL Engine","description":"\u003ch2\u003eFuel Water Separator Filter FS20121 for Cummins\u003c\/h2\u003e\u003cp\u003eThis fuel water separator filter, referencing OEM cross number FS20121, is a replacement filter designed to remove water and debris from diesel fuel for Cummins engines. It protects the fuel injection system by ensuring clean, dry fuel reaches the engine for reliable operation.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis fuel water separator filter for Cummins engines combines particulate filtration with water separation to protect sensitive fuel injectors from damage. Designed as a direct replacement for part number FS20121, it helps prevent rust, corrosion, and microbial growth in the fuel system. This fuel water separator filter is a critical maintenance component for diesel engines in trucks, generators, and industrial equipment.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAdvanced water-separating media separates emulsified water from diesel fuel\u003c\/li\u003e\n\u003cli\u003eHigh-dirt-holding capacity extends service life and reduces maintenance frequency\u003c\/li\u003e\n\u003cli\u003eRobust construction withstands fuel pressures and temperature variations\u003c\/li\u003e\n\u003cli\u003ePrecision-engineered filtration media removes abrasive particles down to micron levels\u003c\/li\u003e\n\u003cli\u003eBuilt-in drain valve allows for easy water removal during service\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Cummins L9\u003c\/li\u003e\n\u003cli\u003efor Cummins B6.7\u003c\/li\u003e\n\u003cli\u003efor Cummins V\u003c\/li\u003e\n\u003cli\u003efor Cummins QSB\u003c\/li\u003e\n\u003cli\u003efor Cummins QSL\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFS20121\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFuel Water Separator Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRemoves water and contaminants\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCoalescing filtration media\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Why is a water separator filter important for a Cummins engine? \u003cstrong\u003eA:\u003c\/strong\u003e Water in diesel fuel can cause injector corrosion, poor combustion, and engine failure. This filter removes water and particles to maintain fuel system integrity and performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can this filter be used in place of the original FS20121 filter? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, this aftermarket filter is designed as a direct replacement for the FS20121 part number, with matching dimensions and filtration capability. Always confirm thread size and bowl alignment before installation.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Part Outfitters","offers":[{"title":"Default Title","offer_id":46611671875770,"sku":"ZZ3F06075","price":66.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0779\/2476\/1786\/files\/s-l1600_7c86eddd-a9ff-442b-90fe-35db58558a6a.jpg?v=1789009356","url":"https:\/\/partoutfitters.com\/products\/fuel-water-separator-filter-fs20121-for-cummins-l9-b6-7-v-qsb-qsl-engine","provider":"Part Outfitters","version":"1.0","type":"link"}