{"product_id":"fuel-pump-diaphragm-kit-for-chrysler-force-outboards-replaces-oem-21-42990a7-21-857005a1-sierra-18-7817","title":"Sierra 18-7817 Fuel Pump Diaphragm Kit, Replaces OEM 21-857005A1, for Mercury Outboard","description":"\u003cp\u003eThe Sierra 18-7817 Fuel Pump Diaphragm Kit is a rebuild kit for the fuel pump on Mercury outboard engines. It is built to meet or exceed the performance of the original equipment part it replaces, giving boat owners a reliable way to restore fuel pump function without replacing the entire pump assembly.\u003c\/p\u003e\u003cp\u003eThe kit centers on a diaphragm designed as a direct equivalent to OEM part 21-857005A1, along with a fiber washer (part 18-4261, OE 19643) used during reassembly. Installing a fresh diaphragm and washer addresses common fuel pump issues such as loss of prime, fuel leakage, or inconsistent fuel delivery that develop as the original diaphragm material ages and hardens from repeated exposure to fuel and heat in the engine compartment.\u003c\/p\u003e\u003cp\u003eThe kit is compact and lightweight, packaged at 7 x 6 x 1 inches and weighing 0.04 pounds, and is intended for the rear position of the fuel pump assembly. Sierra sources its parts to the same specifications used by original equipment engine manufacturers and boat builders, so the 18-7817 kit is intended as a drop-in equivalent for the fuel pump diaphragm it replaces on applicable Mercury outboard engines.\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 18-7817\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999323019\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Fuel Pump Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Diaphragm; Fiber Washer (Part 18-4261, OE 19643)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Rear\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 7 x 6 x 1 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Mercury outboard engines.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e21-857005A1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-7817 Fuel Pump Diaphragm Kit include?\u003c\/strong\u003e The 18-7817 kit includes a diaphragm and a fiber washer (part 18-4261, OE 19643) needed to rebuild the fuel pump.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-7817 replace?\u003c\/strong\u003e Sierra 18-7817 replaces OEM part 21-857005A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines is this fuel pump kit for?\u003c\/strong\u003e This kit is designed for Mercury outboard engines that use the fuel pump diaphragm covered by OEM part 21-857005A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-7817 kit weigh?\u003c\/strong\u003e The Sierra 18-7817 Fuel Pump Diaphragm Kit weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of this kit?\u003c\/strong\u003e The 18-7817 kit ships in a package measuring 7 x 6 x 1 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere does the diaphragm in this kit install on the fuel pump?\u003c\/strong\u003e The 18-7817 diaphragm is used in the rear position of the fuel pump assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-7817 kit genuine OEM or aftermarket?\u003c\/strong\u003e It is a Sierra-manufactured replacement kit engineered to meet or exceed the original equipment part it replaces, rather than a part sourced directly from the engine manufacturer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the kit include a gasket or just the diaphragm?\u003c\/strong\u003e The 18-7817 kit includes the diaphragm along with a fiber washer (part 18-4261, OE 19643); it does not list a separate gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the fiber washer part number included in this kit?\u003c\/strong\u003e The fiber washer included with the 18-7817 diaphragm kit is Sierra part 18-4261, cross-referenced to OE number 19643.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this kit stop a Mercury outboard fuel pump from losing prime or leaking?\u003c\/strong\u003e Installing the diaphragm and washer from the 18-7817 kit addresses fuel pump issues like lost prime and leakage that result from a worn original diaphragm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-7817 the correct number to search for this fuel pump kit?\u003c\/strong\u003e Yes, 18-7817 is the manufacturer part number for this Sierra fuel pump diaphragm kit.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988388688091,"sku":"SIE-18-7817","price":21.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-7817_lg__13480.1558131134.500.750.jpg?v=1785188347","url":"https:\/\/www.goodvibesmarina.com\/products\/fuel-pump-diaphragm-kit-for-chrysler-force-outboards-replaces-oem-21-42990a7-21-857005a1-sierra-18-7817","provider":"Good Vibes Marina","version":"1.0","type":"link"}