{"product_id":"5471899rx-genuine-cummins®-def-doser-pump","title":"5471899RX | Genuine Cummins® DEF Doser Pump","description":"\u003cp\u003eA DEF Doser Pump (Diesel Exhaust Fluid doser pump)\u003cstrong\u003e 5471899RX\u003c\/strong\u003e is a component in modern diesel vehicles that injects Diesel Exhaust Fluid (DEF) into the exhaust system to reduce harmful emissions.\u003c\/p\u003e\n\u003ch3\u003eGeneral Specifications\u003c\/h3\u003e\n\u003cdiv class=\"ftp-table-wrap\"\u003e\n\u003ctable class=\"ftp-spec\" style=\"width: 100.029%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"width: 10.2319%;\"\u003eCondition\u003c\/th\u003e\n\u003ctd style=\"width: 89.5927%;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"width: 10.2319%;\"\u003ePart Number\u003c\/th\u003e\n\u003ctd style=\"width: 89.5927%;\"\u003e5471899RX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"width: 10.2319%;\"\u003eBrand\u003c\/th\u003e\n\u003ctd style=\"width: 89.5927%;\"\u003eCummins\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"width: 10.2319%;\"\u003eFits\u003c\/th\u003e\n\u003ctd style=\"width: 89.5927%;\"\u003eCummins B6.7, Cummins X15, Cummins QSB3.3, Cummins QSG12, Cummins QSX12, Cummins QSK19, Cummins QSK23, Cummins QSK38, Cummins QSK50, Cummins QSK60, Cummins QSK78, Cummins QST30.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3\u003ePurpose \u0026amp; Function\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDelivers the correct amount of Diesel Exhaust Fluid (DEF)\u003c\/strong\u003e\u003cbr\u003eIt pulls DEF from the tank and sends a precise, pressurized amount into the exhaust system.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eReduces harmful NOx emissions\u003c\/strong\u003e\u003cbr\u003eInside a Selective Catalytic Reduction (SCR) system, the DEF turns into ammonia and reacts with nitrogen oxides (NOx), converting them into:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eNitrogen (harmless)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWater vapor (harmless)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEnsures the system works efficiently\u003c\/strong\u003e\u003cbr\u003eIt carefully controls dosing so:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eToo little DEF doesn’t cause emissions failures\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eToo much DEF doesn’t waste fluid or damage components\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSigns of a Bad DEF Doser Pump\u003c\/h3\u003e\n\u003ch4\u003e1. Check Engine Light (CEL)\u003c\/h4\u003e\n\u003cp\u003eThe most common sign.\u003cbr\u003eYou’ll usually see fault codes related to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eSCR system performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDEF pressure too low\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDEF dosing malfunction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNOx efficiency below threshold\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e2. Emissions Warning Message\u003c\/h4\u003e\n\u003cp\u003eYou may see messages like:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e“Exhaust Fluid System Fault”\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e“Service DEF System”\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e“Poor DEF Quality” (even when fluid is good)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e3. Reduced Engine Power (Limp Mode)\u003c\/h4\u003e\n\u003cp\u003eIf the system detects improper DEF dosing, the vehicle may:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eLimit engine power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLimit top speed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eStart a countdown to limited starts or no restart\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e4. DEF Pressure Problems\u003c\/h4\u003e\n\u003cp\u003eA failing pump may not build proper pressure, causing:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eRough engine performance in some cases\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSCR efficiency faults\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInconsistent DEF consumption\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e5. Excessive or No DEF Usage\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eUsing \u003cstrong\u003etoo much DEF\u003c\/strong\u003e (over-dosing)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUsing \u003cstrong\u003ealmost none\u003c\/strong\u003e (under-dosing)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEither condition can indicate a pump issue.\u003c\/p\u003e\n\u003ch4\u003e6. Crystallized DEF Around Components\u003c\/h4\u003e\n\u003cp\u003eIf the pump or lines leak, you might see:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhite crystal buildup near DEF lines or pump\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDEF smell near the vehicle\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e7. Vehicle Won’t Restart\u003c\/h4\u003e\n\u003cp\u003eIn many modern diesel systems, if the SCR fault is not fixed:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eThe vehicle may eventually refuse to start after shutdown.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAbout Cummins\u003c\/h3\u003e\n\u003cp\u003eCummins is a leading American manufacturer of diesel and natural gas engines, as well as power generation systems and emissions solutions. Founded in 1919 and headquartered in Columbus, Indiana, Cummins is known globally for its durable, high-performance engines used in trucks, buses, construction equipment, agriculture, and power systems.\u003c\/p\u003e\n\u003cp\u003eThe brand is widely respected for its innovation in clean diesel technology, including aftertreatment systems, turbochargers, and advanced electronics that help reduce emissions while maximizing engine efficiency and reliability.\u003c\/p\u003e","brand":"Cummins","offers":[{"title":"Default Title","offer_id":52133550129399,"sku":"5471899RX","price":999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/7080\/3959\/files\/8fi9DMqG5am9p4T9DHgYYesFkERIbAvPSeCz2-jg4yVwMS7kLpTPqUpk9YTLTSbf4wn4stAE30IeN9lzawCL4onWjzmHXJIH_BPX5iieUwTYguQ4Q2maNAw2Bp6Wk6tn1_24p8uyov-VmUKsewcysSync5CpWRvQs8pmhldh2ffL_1PlCOz3Qfb.jpg?v=1794373977","url":"https:\/\/forcetruckparts.com\/products\/5471899rx-genuine-cummins%c2%ae-def-doser-pump","provider":"Force Truck Parts","version":"1.0","type":"link"}