{"product_id":"sierra-18-7688-fuel-injector-for-mercruiser-4-3l-5-0l-5-7l-6-2l-mpi-replaces-885176","title":"Sierra 18-7688 Fuel Injector for Mercruiser 6.2L 377 V-8 MPI Engines","description":"\u003cp\u003eThe Sierra 18-7688 is a fuel injector engineered for Mercruiser 6.2L 377 V-8 engines equipped with multi-port fuel injection (MPI). It is built to deliver precise fuel metering into the engine's intake, supporting the combustion timing and fuel efficiency these V-8 marine engines depend on. This injector is application-specific to the 6.2L 377 V-8 platform, covering the standard MPI configuration as well as the MPI Horizon and MPI Horizon MIE variants, including versions equipped with DTS (Digital Throttle and Shift) electronic controls.\u003c\/p\u003e\u003cp\u003eCoverage spans model years 2002-2004 and 2004-2007 for the standard MPI, MPI Horizon, and MPI Horizon MIE configurations, and 2005-2007 for the DTS-equipped versions of those same engine families. Because fitment is tied to specific engine serial number ranges within these years, confirming your engine's serial number against the exact range is recommended before ordering. The injector is compact, measuring 0.39 x 0.39 x 0.39 inches, and weighs 0.06 pounds, consistent with the small form factor required to mount directly on the intake manifold alongside its companion injectors.\u003c\/p\u003e\u003cp\u003eAs a direct-fit replacement part, the 18-7688 is intended for engine owners performing fuel system maintenance, diagnosing a misfiring or rough-running cylinder, or replacing a failed or clogged injector as part of a full-set service.\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 18-7688\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Fuel Injector\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Application:\u003c\/strong\u003e 6.2L 377 V-8 (Mercruiser MPI, MPI Horizon, MPI Horizon MIE, and DTS variants)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Years:\u003c\/strong\u003e 2002-2004 and 2004-2007 (MPI, MPI Horizon, MPI Horizon MIE); 2005-2007 (DTS variants)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.06 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282287399\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser 6.2L 377 V-8 MPI, model years 2002-2004 and 2004-2007\u003c\/li\u003e\n\u003cli\u003eMercruiser 6.2L 377 V-8 MPI Horizon, model years 2002-2004 and 2004-2007\u003c\/li\u003e\n\u003cli\u003eMercruiser 6.2L 377 V-8 MPI Horizon MIE, model years 2002-2004 and 2004-2007\u003c\/li\u003e\n\u003cli\u003eMercruiser 6.2L 377 V-8 MPI DTS, MPI Horizon DTS, and MPI Horizon MIE DTS, model years 2005-2007\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-7688 fuel injector fit?\u003c\/strong\u003e The 18-7688 is built for Mercruiser 6.2L 377 V-8 engines running multi-port fuel injection (MPI), including the standard MPI, MPI Horizon, and MPI Horizon MIE configurations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-7688 work with DTS-equipped engines?\u003c\/strong\u003e Yes, this injector also fits the DTS (Digital Throttle and Shift) versions of the MPI, MPI Horizon, and MPI Horizon MIE 6.2L 377 V-8 engines, covering model years 2005-2007.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat model years does part number 18-7688 cover?\u003c\/strong\u003e Coverage is 2002-2004 and 2004-2007 for the standard MPI, MPI Horizon, and MPI Horizon MIE engines, and 2005-2007 for the DTS variants of those same engine families.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-7688 fuel injector weigh?\u003c\/strong\u003e It weighs 0.06 pounds, in line with the compact size of a single-cylinder marine fuel injector.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this fuel injector?\u003c\/strong\u003e The Sierra 18-7688 measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-7688 an OEM or aftermarket part?\u003c\/strong\u003e It is sold under the Sierra brand as part number 18-7688, engineered specifically for the Mercruiser 6.2L 377 V-8 MPI engine family listed in its application coverage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill one 18-7688 injector service a full engine rebuild?\u003c\/strong\u003e This listing is for a single fuel injector, part number 18-7688; a V-8 engine uses multiple injectors, so quantity needed depends on how many cylinders require replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my Mercruiser 6.2L engine uses the 18-7688?\u003c\/strong\u003e Fitment for the 18-7688 depends on your engine's specific serial number range within the 6.2L 377 V-8 MPI, MPI Horizon, MPI Horizon MIE, or DTS families, so confirming your engine's serial number against those ranges is the reliable way to verify fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate a fuel injector like the 18-7688 needs replacing?\u003c\/strong\u003e A clogged or failed injector on a 6.2L 377 V-8 typically shows up as a rough-running or misfiring cylinder, reduced power, or uneven idle, which the 18-7688 is designed to correct when replaced.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-7688 fit non-MPI 6.2L 377 V-8 engines?\u003c\/strong\u003e No, this part is specific to fuel-injected (MPI) versions of the 6.2L 377 V-8, including its Horizon, Horizon MIE, and DTS variants.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988386066651,"sku":"SIE-18-7688","price":256.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-7688__49411.1558186442.500.750.jpg?v=1785188808","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-7688-fuel-injector-for-mercruiser-4-3l-5-0l-5-7l-6-2l-mpi-replaces-885176","provider":"Good Vibes Marina","version":"1.0","type":"link"}