{"product_id":"donaldson-p555776-fuel-filter-cummins-x15-isx","title":"Donaldson P555776 Fuel Filter | Cummins X15, ISX \u0026 Heavy-Duty Diesel Engines","description":"\u003ch2\u003eDonaldson P555776 Secondary Fuel Filter for Cummins X15 \u0026amp; ISX Engines\u003c\/h2\u003e\n\u003cp\u003eThe Donaldson P555776 Fuel Filter is a premium secondary diesel fuel filter engineered to provide superior fuel cleanliness and injector protection for Cummins X15, Cummins ISX, and other heavy-duty diesel engines. Designed to remove fine contaminants before they reach sensitive fuel system components, the P555776 helps maximize fuel system reliability, engine performance, and equipment uptime.\u003c\/p\u003e\n\u003cp\u003eModern common rail diesel engines require exceptionally clean fuel to operate efficiently. The Donaldson P555776 delivers high-efficiency filtration that helps protect expensive fuel injectors, fuel pumps, and emissions system components from harmful contaminants that can lead to reduced performance and costly repairs.\u003c\/p\u003e\n\u003cp\u003eTrusted by fleets, owner-operators, repair facilities, and diesel performance shops across North America, the P555776 is a proven solution for maintaining peak fuel system performance in demanding operating environments.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePremium secondary fuel filter\u003c\/li\u003e\n\u003cli\u003eHigh-efficiency contaminant removal\u003c\/li\u003e\n\u003cli\u003eProtects fuel injectors and fuel pumps\u003c\/li\u003e\n\u003cli\u003eDesigned for high-pressure common rail fuel systems\u003c\/li\u003e\n\u003cli\u003eMaintains proper fuel flow\u003c\/li\u003e\n\u003cli\u003eHelps improve fuel system reliability\u003c\/li\u003e\n\u003cli\u003eHeavy-duty commercial-grade construction\u003c\/li\u003e\n\u003cli\u003eSpin-on design for easy installation\u003c\/li\u003e\n\u003cli\u003eFleet-proven Donaldson filtration technology\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e P555776\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Donaldson\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Type:\u003c\/strong\u003e Secondary Fuel Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Spin-On\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 4.65\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 8.54\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 1-14 UNS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Cummins X15 \u0026amp; ISX Fuel Systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eBenefits of Replacing Your Fuel Filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProtects expensive fuel injectors\u003c\/li\u003e\n\u003cli\u003eMaintains proper fuel pressure\u003c\/li\u003e\n\u003cli\u003eImproves fuel system efficiency\u003c\/li\u003e\n\u003cli\u003eReduces injector wear\u003c\/li\u003e\n\u003cli\u003eImproves engine performance\u003c\/li\u003e\n\u003cli\u003eHelps maximize fuel economy\u003c\/li\u003e\n\u003cli\u003eReduces maintenance costs\u003c\/li\u003e\n\u003cli\u003eSupports longer component life\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCummins X15 Engines\u003c\/li\u003e\n\u003cli\u003eCummins ISX Engines\u003c\/li\u003e\n\u003cli\u003eFreightliner Cascadia\u003c\/li\u003e\n\u003cli\u003eKenworth T680\u003c\/li\u003e\n\u003cli\u003eKenworth W990\u003c\/li\u003e\n\u003cli\u003eKenworth W900\u003c\/li\u003e\n\u003cli\u003ePeterbilt 579\u003c\/li\u003e\n\u003cli\u003ePeterbilt 389\u003c\/li\u003e\n\u003cli\u003eInternational LT Series\u003c\/li\u003e\n\u003cli\u003eWestern Star Trucks\u003c\/li\u003e\n\u003cli\u003eFleet \u0026amp; Vocational Truck Applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eMajor Cross Reference Numbers\u003c\/h3\u003e\n\u003cp\u003eThe Donaldson P555776 crosses with many popular OEM and aftermarket fuel filters used throughout the heavy-duty trucking industry:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCummins 4934845\u003c\/li\u003e\n\u003cli\u003eCummins 5472251\u003c\/li\u003e\n\u003cli\u003eCummins 3959612\u003c\/li\u003e\n\u003cli\u003eCummins 3331516\u003c\/li\u003e\n\u003cli\u003eFleetguard FF5488\u003c\/li\u003e\n\u003cli\u003eFleetguard FF5776\u003c\/li\u003e\n\u003cli\u003eFleetguard FF63054NN\u003c\/li\u003e\n\u003cli\u003eBaldwin BF46065\u003c\/li\u003e\n\u003cli\u003eBaldwin BF46064\u003c\/li\u003e\n\u003cli\u003eWIX WF10176\u003c\/li\u003e\n\u003cli\u003eNAPA 3676\u003c\/li\u003e\n\u003cli\u003eLuber-Finer LFF5776\u003c\/li\u003e\n\u003cli\u003eDonaldson P550774\u003c\/li\u003e\n\u003cli\u003eDonaldson P583177\u003c\/li\u003e\n\u003cli\u003eCarquest 86776\u003c\/li\u003e\n\u003cli\u003eAlliance ABPN10GFF5776\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAlways verify fitment by engine serial number and OEM requirements before ordering. Some applications may use multiple filter configurations depending on fuel system design.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eWhy Secondary Fuel Filtration Matters\u003c\/h3\u003e\n\u003cp\u003eSecondary fuel filters serve as the final line of defense before fuel reaches high-pressure injectors. In modern diesel engines such as the Cummins X15 and ISX, injector tolerances are extremely tight, making proper filtration critical to fuel system longevity and engine reliability.\u003c\/p\u003e\n\u003cp\u003eReplacing secondary fuel filters at recommended service intervals helps prevent injector damage, fuel pressure issues, hard starting conditions, and expensive fuel system repairs.\u003c\/p\u003e\n\u003chr\u003e\n\u003cdiv style=\"background: #f8f8f8; padding: 25px; border-left: 4px solid #ff6a00; margin: 25px 0;\"\u003e\n\u003ch3\u003e🔥 High Conversion Add-On: Protect Thousands in Fuel System Components\u003c\/h3\u003e\n\u003cp\u003eA complete set of injectors and fuel system components can cost thousands of dollars to replace. The Donaldson P555776 helps remove damaging contaminants before they reach critical components, helping maximize fuel system life and reduce costly downtime.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e✔ Cummins X15 Compatible\u003c\/li\u003e\n\u003cli\u003e✔ Cummins ISX Compatible\u003c\/li\u003e\n\u003cli\u003e✔ High-Efficiency Filtration\u003c\/li\u003e\n\u003cli\u003e✔ Injector Protection\u003c\/li\u003e\n\u003cli\u003e✔ Fleet-Proven Reliability\u003c\/li\u003e\n\u003cli\u003e✔ Trusted Donaldson Quality\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003chr\u003e\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\u003cul\u003e\n\u003cli\u003e✔ Donaldson P583177 Primary Fuel Filter\u003c\/li\u003e\n\u003cli\u003e✔ Donaldson P559000 Oil Filter\u003c\/li\u003e\n\u003cli\u003e✔ Donaldson DBL7900 Blue® Oil Filter\u003c\/li\u003e\n\u003cli\u003e✔ Donaldson P559674 Service Kit\u003c\/li\u003e\n\u003cli\u003e✔ Cummins X15 Air Filters\u003c\/li\u003e\n\u003cli\u003e✔ Premium Diesel Engine Oil\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eComplete your preventive maintenance service by replacing both primary and secondary fuel filters together for maximum fuel system protection.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Donaldson","offers":[{"title":"Default Title","offer_id":66905760727085,"sku":null,"price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/donaldson-p555776-fuel-filter-cummins-x15-isx-heavy-duty-diesel-enginesdonaldsonperformance-diesel-group-4475123.jpg?v=1782860948","url":"https:\/\/performancedieselgroup.com\/products\/donaldson-p555776-fuel-filter-cummins-x15-isx","provider":"Performance Diesel Group","version":"1.0","type":"link"}