{"product_id":"donaldson-p550879-fuel-filter","title":"Donaldson P550879 Fuel Filter","description":"\u003ch2\u003eFuel Filtration for Heavy-Duty Applications\u003c\/h2\u003e\u003cp\u003eDonaldson P550879 is a secondary spin-on fuel filter built for heavy-duty diesel fuel systems. It uses synthetic media and a 99% efficiency rating tested to SAE J1985 to help maintain clean fuel flow in demanding service.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSecondary fuel filter with spin-on design for straightforward service replacement.\u003c\/li\u003e\n\u003cli\u003eSynthetic filter media for consistent filtration performance.\u003c\/li\u003e\n\u003cli\u003e99% efficiency rating tested to SAE J1985.\u003c\/li\u003e\n\u003cli\u003e7\/8-14 UN thread size with 3.66-inch outer diameter.\u003c\/li\u003e\n\u003cli\u003ePrimary application references Cummins 4940647.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eThis Donaldson fuel filter is engineered as a secondary filter for diesel fuel delivery systems that require fine filtration after the primary stage. The spin-on style, 174 mm length, and 2.83-inch gasket OD support serviceability in commercial truck applications. It cross-references Monroe Shocks \u0026amp; Struts (e.g., 4940647, FF1173) for the same application. Compatible with applications such as 2012-2014 Freightliner 108SD and 114SD, 2008-2013 Kenworth T270, and 2000-2007 Kenworth T300, this P550879 is used where a secondary fuel filter is specified. The P550879 part number is also associated with 2019 Mack Granite and 2007 Peterbilt 330 fuel filter applications.\u003c\/p\u003e\u003ch2\u003eWhat It Is Used For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacing a worn or restricted secondary fuel filter.\u003c\/li\u003e\n\u003cli\u003eRestoring proper fuel flow through the diesel filtration system.\u003c\/li\u003e\n\u003cli\u003eReducing contamination that can affect injector performance.\u003c\/li\u003e\n\u003cli\u003eAddressing service intervals where a spin-on fuel filter is specified.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify thread size, gasket dimensions, and filter style before installation. Confirm the application uses a secondary spin-on fuel filter and match the part number P550879 to the service specification. Always follow the vehicle manufacturer’s fuel system service procedure when replacing the filter.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eDonaldson P550879 is built to a published SAE J1985 efficiency standard and uses synthetic media for filtration consistency. The P550879 part number is listed against multiple heavy-duty truck applications, including Freightliner, Kenworth, International, Peterbilt, and Mack.\u003c\/p\u003e","brand":"Donaldson","offers":[{"title":"Default Title","offer_id":53621591376053,"sku":"BBNQ-P550879","price":45.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/VF_P550879_Fro.jpg?v=1793168604","url":"https:\/\/www.partcatalog.com\/products\/donaldson-p550879-fuel-filter","provider":"PartCatalog","version":"1.0","type":"link"}