{"product_id":"sierra-18-3319-water-pump-kit-for-mercury-outboards-replaces-mercury-46-42579a4-impeller-upper-lower-housings-base","title":"Sierra 18-3319 Water Pump Kit with Upper and Lower Housings - Replaces Mercury Marine 46-42579A4","description":"\u003cp\u003eThe Sierra 18-3319 Water Pump Kit is a complete replacement water pump kit engineered for Mercury Marine outboard applications, designed to restore proper cooling system function. This kit includes the water pump base (Sierra 18-3419) along with the upper and lower housing components needed for a full water pump rebuild, allowing the raw water cooling circuit to draw and circulate water through the engine as intended. The kit is built to meet or exceed original equipment quality standards, giving installers a direct-fit alternative to the factory Mercury Marine part.\u003c\/p\u003e\u003cp\u003eBecause water pump components are fit specific, buyers should confirm part numbers against their existing pump assembly before ordering to ensure proper fit. The kit corresponds to Mercury Marine OEM part number 46-42579A4, making it a straightforward cross-reference for anyone replacing a worn or failed pump assembly using the original Mercury part number.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3319\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Water Pump Kit w\/Upper and Lower Housings - Mercury\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Water Pump Kit (includes Water Pump Base 18-3419)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.9 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999315816\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine outboard applications using OEM part number 46-42579A4\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 46-42579A4\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3319 Water Pump Kit include?\u003c\/strong\u003e The kit includes a water pump base, identified separately as Sierra 18-3419, along with the upper and lower housing components needed to rebuild the water pump assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat Mercury Marine part number does the Sierra 18-3319 replace?\u003c\/strong\u003e It replaces Mercury Marine OEM part number 46-42579A4.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3319 Water Pump Kit weigh?\u003c\/strong\u003e This water pump kit weighs 0.9 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3319 a genuine Mercury Marine part or an aftermarket replacement?\u003c\/strong\u003e The Sierra 18-3319 is an aftermarket water pump kit built to meet or exceed original equipment quality, cross-referenced to Mercury Marine part number 46-42579A4 rather than being a Mercury-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the 18-3319 will fit my Mercury outboard?\u003c\/strong\u003e Because water pump components are fit specific, confirm the part number on your existing pump assembly matches Mercury Marine 46-42579A4 before ordering the 18-3319 kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3319 kit come with an impeller?\u003c\/strong\u003e The listed included components for the 18-3319 kit are the water pump base (18-3419) and the upper and lower housings; an impeller is not listed among the included components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3319 Water Pump Kit?\u003c\/strong\u003e The UPC for this Sierra 18-3319 kit is 030999315816.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sierra 18-3319 be used to replace a full water pump assembly rather than just the impeller?\u003c\/strong\u003e Yes, the 18-3319 is a kit that includes the pump base and upper and lower housings, making it suited to a fuller water pump rebuild rather than an impeller-only replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer part number for this water pump kit?\u003c\/strong\u003e The manufacturer part number is 18-3319, sold under the Sierra brand.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does fit matter so much when ordering a water pump kit like the 18-3319?\u003c\/strong\u003e Water pump components vary by engine and housing design, so the 18-3319 is fit specific; checking that its cross-reference number, Mercury Marine 46-42579A4, matches your current part is the way to ensure proper fit.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988143386843,"sku":"SIE-18-3319","price":54.55,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3319__07430.1722511956.500.750.jpg?v=1785188020","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3319-water-pump-kit-for-mercury-outboards-replaces-mercury-46-42579a4-impeller-upper-lower-housings-base","provider":"Good Vibes Marina","version":"1.0","type":"link"}