{"product_id":"donaldson-p555776-secondary-fuel-filter","title":"Donaldson P555776 Secondary Fuel Filter | Cummins X15 \u0026 Heavy-Duty Diesel Applications","description":"\u003ch2\u003eDonaldson P555776 Secondary Fuel Filter – Advanced Protection for Cummins X15 Fuel Systems\u003c\/h2\u003e\n\n\u003cp\u003e\nLooking for a high-efficiency replacement fuel filter for your Cummins X15 or heavy-duty diesel engine? The Donaldson P555776 Secondary Fuel Filter is engineered to protect today's high-pressure common rail fuel systems by removing harmful contaminants before they reach sensitive injectors and fuel system components.\n\u003c\/p\u003e\n\n\u003cp\u003e\nFeaturing Donaldson's advanced Synteq™ filtration media, the P555776 delivers exceptional contaminant capture, excellent dirt-holding capacity, and reliable fuel flow under demanding operating conditions. This premium spin-on secondary fuel filter helps extend injector life, reduce maintenance costs, and support maximum engine performance.\n\u003c\/p\u003e\n\n\u003cp\u003e\nCommonly used on Cummins X15-powered Freightliner Cascadia, Peterbilt, Kenworth, Western Star, and International trucks, the Donaldson P555776 is trusted by fleets and owner-operators nationwide for dependable fuel system protection. :contentReference[oaicite:0]{index=0}\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003ePremium secondary fuel filtration\u003c\/li\u003e\n\n\u003cli\u003eAdvanced Donaldson Synteq™ filtration media\u003c\/li\u003e\n\n\u003cli\u003eHelps protect high-pressure fuel injectors\u003c\/li\u003e\n\n\u003cli\u003eSuperior contaminant removal efficiency\u003c\/li\u003e\n\n\u003cli\u003eExcellent dirt-holding capacity\u003c\/li\u003e\n\n\u003cli\u003eSpin-on design for easy servicing\u003c\/li\u003e\n\n\u003cli\u003eDesigned for severe-duty trucking applications\u003c\/li\u003e\n\n\u003cli\u003eHelps maintain optimal fuel system performance\u003c\/li\u003e\n\n\u003cli\u003eMeets or exceeds OEM performance requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e P555776\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Donaldson\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eFilter Type:\u003c\/strong\u003e Secondary Fuel Filter\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Spin-On\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e Synteq™\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 4.65\" (118 mm)\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 8.82\" (224 mm)\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e M90 x 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eBenefits of Replacing Your Fuel Filter\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eProtects expensive fuel injectors\u003c\/li\u003e\n\n\u003cli\u003eReduces fuel system contamination\u003c\/li\u003e\n\n\u003cli\u003eSupports proper fuel pressure\u003c\/li\u003e\n\n\u003cli\u003eImproves engine efficiency\u003c\/li\u003e\n\n\u003cli\u003eHelps prevent injector wear\u003c\/li\u003e\n\n\u003cli\u003eSupports maximum uptime\u003c\/li\u003e\n\n\u003cli\u003ePromotes long-term engine reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eSigns Your Fuel Filter Needs Replacement\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eHard starting\u003c\/li\u003e\n\n\u003cli\u003eLoss of power under load\u003c\/li\u003e\n\n\u003cli\u003ePoor acceleration\u003c\/li\u003e\n\n\u003cli\u003eReduced fuel economy\u003c\/li\u003e\n\n\u003cli\u003eFuel pressure faults\u003c\/li\u003e\n\n\u003cli\u003eCheck engine light\u003c\/li\u003e\n\n\u003cli\u003eRough idle or hesitation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\n\u003cp\u003e\nFrequently used on Cummins X15 engines and other heavy-duty diesel applications operating in regional, vocational, and long-haul trucking environments.\n\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eFreightliner Cascadia\u003c\/li\u003e\n\u003cli\u003ePeterbilt 579\u003c\/li\u003e\n\u003cli\u003ePeterbilt 389\u003c\/li\u003e\n\u003cli\u003eKenworth T680\u003c\/li\u003e\n\u003cli\u003eKenworth W990\u003c\/li\u003e\n\u003cli\u003eWestern Star 5700XE\u003c\/li\u003e\n\u003cli\u003eInternational LT Series\u003c\/li\u003e\n\u003cli\u003eVarious Cummins-powered equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eCross Reference Numbers\u003c\/h3\u003e\n\n\u003cp\u003e\nThe Donaldson P555776 crosses with the following OEM and aftermarket part numbers:\n\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eBaldwin BF9885\u003c\/li\u003e\n\u003cli\u003eFleetguard FF5776\u003c\/li\u003e\n\u003cli\u003eLuber-Finer LFF6776\u003c\/li\u003e\n\u003cli\u003eWIX WF10123\u003c\/li\u003e\n\u003cli\u003eTruckPro DNP555776\u003c\/li\u003e\n\u003cli\u003eCummins 2864993\u003c\/li\u003e\n\u003cli\u003eCummins 2893612\u003c\/li\u003e\n\u003cli\u003eCummins 3685306\u003c\/li\u003e\n\u003cli\u003eCummins 4331007\u003c\/li\u003e\n\u003cli\u003eCummins 87904MFF5776\u003c\/li\u003e\n\u003cli\u003e600123\u003c\/li\u003e\n\u003cli\u003e96498\u003c\/li\u003e\n\u003cli\u003eFF1219\u003c\/li\u003e\n\u003cli\u003eFTGFF5776\u003c\/li\u003e\n\u003cli\u003eMH30018\u003c\/li\u003e\n\u003cli\u003eS26381\u003c\/li\u003e\n\u003cli\u003eSF10123\u003c\/li\u003e\n\u003cli\u003eWK12003\u003c\/li\u003e\n\u003cli\u003eZ1007\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\nThese cross references help customers locate replacement fuel filters across multiple manufacturers and platforms. :contentReference[oaicite:1]{index=1}\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhy Fuel Filtration Matters on the Cummins X15\u003c\/h3\u003e\n\n\u003cp\u003e\nModern Cummins X15 fuel systems operate at extremely high pressures and require exceptionally clean fuel. Contaminants that pass through a worn or low-quality filter can damage injectors, fuel pumps, and emissions components, leading to expensive repairs and unnecessary downtime.\n\u003c\/p\u003e\n\n\u003cp\u003e\nReplacing your secondary fuel filter at recommended service intervals helps maintain proper fuel delivery, improve reliability, and protect your engine investment.\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cdiv style=\"background:#f8f8f8;padding:25px;border-left:4px solid #ff6a00;margin:25px 0;\"\u003e\n\u003ch3\u003e🔥 Protect Your Fuel System Before Problems Start\u003c\/h3\u003e\n\n\u003cp\u003e\nThe Donaldson P555776 is designed to remove damaging contaminants before they reach critical fuel system components.\n\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e✔ Advanced Synteq™ Media\u003c\/li\u003e\n\u003cli\u003e✔ Injector Protection\u003c\/li\u003e\n\u003cli\u003e✔ Cummins X15 Compatible\u003c\/li\u003e\n\u003cli\u003e✔ Extended Service Life\u003c\/li\u003e\n\u003cli\u003e✔ Fleet-Proven Reliability\u003c\/li\u003e\n\u003cli\u003e✔ Heavy-Duty Construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\nTrusted by fleets and owner-operators who demand maximum uptime and dependable engine performance.\n\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003cdiv style=\"background:#fff7ef;padding:20px;border:1px solid #ffb366;border-radius:8px;margin-top:20px;\"\u003e\n\u003ch3\u003e🚛 Frequently Purchased Together\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e✔ Donaldson P559000 Oil Filter\u003c\/li\u003e\n\u003cli\u003e✔ Cummins X15 Air Filters\u003c\/li\u003e\n\u003cli\u003e✔ Fuel Water Separator Filters\u003c\/li\u003e\n\u003cli\u003e✔ Complete PM Service Kits\u003c\/li\u003e\n\u003cli\u003e✔ Engine Oil \u0026amp; Maintenance Supplies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eComplete your preventive maintenance service and reduce costly downtime by replacing all filtration components together.\u003c\/strong\u003e\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Donaldson","offers":[{"title":"Default Title","offer_id":66861405044781,"sku":null,"price":74.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/P555776.jpg?v=1781361872","url":"https:\/\/performancedieselgroup.com\/products\/donaldson-p555776-secondary-fuel-filter","provider":"Performance Diesel Group","version":"1.0","type":"link"}