{"product_id":"sierra-18-3091-water-pump-impeller-for-evinrude-johnson-outboards-replaces-oem-389576","title":"Sierra 18-3091 Impeller Assembly - Marine Water Pump Impeller","description":"\u003cp\u003eThe Sierra 18-3091 Impeller Assembly is a replacement impeller built for the raw water pump on marine engines, the component responsible for pulling in outside water to cool the engine while it runs. As the impeller wears, spins, or loses vanes, cooling flow drops and the engine can run hot; swapping in a fresh Sierra 18-3091 restores that water flow and protects the pump housing and engine from heat damage. Sierra engineers its water pump parts to meet or exceed the performance of the original equipment part being replaced, and the company supplies impellers and pump components to OEM engine manufacturers and boat builders, so the fit and finish match what came off the engine originally.\u003c\/p\u003e\u003cp\u003eThe 18-3091 measures 1.6 x 1.6 x 1 inches and weighs 0.06 pounds, a compact size consistent with a small-engine or outboard raw water pump impeller. It has a white, powder-coated finish. Keeping a spare on hand is good practice for any boat owner who services their own cooling system, since impellers are considered routine wear items and are typically checked or replaced on a seasonal basis.\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 18-3091\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Impeller Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282258702\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Powder Coated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 1.6 x 1.6 x 1 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.06 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 count\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3091?\u003c\/strong\u003e It is an impeller assembly for a marine raw water pump, part number 18-3091, sold by Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-3091 impeller?\u003c\/strong\u003e The Sierra 18-3091 measures 1.6 x 1.6 x 1 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3091 impeller weigh?\u003c\/strong\u003e 0.06 pounds, which is the shipping and product weight for the Sierra 18-3091 impeller assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and finish does the 18-3091 impeller have?\u003c\/strong\u003e White, with a powder-coated finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many impellers come in one order of 18-3091?\u003c\/strong\u003e One count; the Sierra 18-3091 is sold as a single impeller assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3091 an OEM part or aftermarket?\u003c\/strong\u003e The 18-3091 is a Sierra-brand replacement part engineered to meet or exceed the original equipment part it replaces, rather than an OEM-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3091 impeller?\u003c\/strong\u003e 808282258702 is the UPC associated with the Sierra 18-3091 impeller assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a raw water pump impeller need to be replaced?\u003c\/strong\u003e Impellers wear down, lose vanes, or take a set over time, which reduces the water flow the pump draws in to cool the engine; the Sierra 18-3091 is a direct replacement impeller assembly to restore that flow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra make its own water pump parts or resell OEM stock?\u003c\/strong\u003e Sierra manufactures its own line of marine parts, including the 18-3091 impeller assembly, and also supplies parts to OEM engine manufacturers and boat builders.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3091 impeller a wear item that should be replaced on a schedule?\u003c\/strong\u003e Yes, impellers such as the Sierra 18-3091 are a routine wear component in a raw water pump and are commonly inspected or replaced on a seasonal basis.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988139913435,"sku":"SIE-18-3091","price":16.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3091__32438.1737839009.500.750.jpg?v=1785189093","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3091-water-pump-impeller-for-evinrude-johnson-outboards-replaces-oem-389576","provider":"Good Vibes Marina","version":"1.0","type":"link"}