{"product_id":"marine-brass-carburetor-float-for-rochester-4bbl-replaces-mercury-1397-8546-and-omc-383087-mpn-18-7201","title":"Sierra 18-7201 Brass Carburetor Float for Rochester 4MV 4-Barrel Carburetors, Replaces Mercury Marine 1397-8546","description":"\u003cp\u003eThe Sierra 18-7201 is a brass carburetor float built as a direct-fit replacement for Rochester 4MV (Quadrajet-style) 4-barrel marine carburetors. The float is machined brass, chosen for its alcohol-resistant properties so it holds a stable, accurate fuel level in ethanol-blended pump gas without swelling, absorbing fuel, or losing calibration over time the way some composite or plastic floats can. A correctly functioning float is what keeps the carburetor's fuel bowl at the proper level; a worn, waterlogged, or out-of-spec float leads to flooding, hard starting, rough idle, or fuel starvation at speed, so this is a common wear item to inspect and replace during a carburetor rebuild.\u003c\/p\u003e\u003cp\u003eThis float is designed for GM 4.3L and 5.0L marine engines built between 1979 and 1989 that use the R4 4MV carburetor, and it pairs with the Sierra 18-7095 carburetor kit for that same application. It is intended to be installed as part of a rebuild alongside the correct kit rather than as a standalone repair. Sierra manufactures the 18-7201 as a direct equivalent to the OEM Mercury Marine and OMC float numbers it replaces, so it drops into the same carburetor bowl and pivot without modification.\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 18-7201\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Carburetor Float\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarburetor Compatibility:\u003c\/strong\u003e Rochester 4MV 4-barrel carburetor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e GM 4.3L and 5.0L, 1979-89, R4 4MV carburetor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion Carburetor Kit:\u003c\/strong\u003e Sierra 18-7095\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 1397-3327, 1397-8546, 1397-8959; OMC 383087, 983871\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999322135\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM 4.3L, 1979-89, R4 4MV carburetor\u003c\/li\u003e\n\u003cli\u003eGM 5.0L, 1979-89, R4 4MV carburetor\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 1397-3327\u003c\/li\u003e\n\u003cli\u003eMercury Marine 1397-8546\u003c\/li\u003e\n\u003cli\u003eMercury Marine 1397-8959\u003c\/li\u003e\n\u003cli\u003eOMC 383087\u003c\/li\u003e\n\u003cli\u003eOMC 983871\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat carburetors does the Sierra 18-7201 float fit?\u003c\/strong\u003e The Sierra 18-7201 is built for Rochester 4MV 4-barrel carburetors used on GM 4.3L and 5.0L marine engines from 1979-89.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-7201 float made of brass or plastic?\u003c\/strong\u003e It is machined brass, which resists swelling and absorption from ethanol-blended fuel, so the float level stays accurate over time compared to some composite floats.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-7201 replace an OEM Mercury Marine float?\u003c\/strong\u003e Yes, it is a direct equivalent to Mercury Marine float numbers 1397-3327, 1397-8546, and 1397-8959.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-7201 also cross to an OMC float number?\u003c\/strong\u003e Yes, it replaces OMC float numbers 383087 and 983871 in addition to the Mercury Marine numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-7201 float weigh?\u003c\/strong\u003e The Sierra 18-7201 carburetor float weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat carburetor kit should be used with this float?\u003c\/strong\u003e Sierra pairs the 18-7201 float with the 18-7095 carburetor kit for the same 4.3L and 5.0L, 1979-89, R4 4MV applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install just the float without rebuilding the whole carburetor?\u003c\/strong\u003e The 18-7201 is sold as an individual float component and is intended to be installed during a carburetor rebuild alongside the matching 18-7095 kit rather than as a standalone fix.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this float work on a carburetor other than the Rochester 4MV?\u003c\/strong\u003e The Sierra 18-7201 is designed specifically for the Rochester 4MV 4-barrel carburetor used on the listed GM 4.3L and 5.0L engines; it is not specified for other carburetor models in Sierra's catalog.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a carburetor float need to be replaced?\u003c\/strong\u003e A brass float like the 18-7201 can develop leaks or lose calibration with age, which raises or lowers the fuel bowl level and causes symptoms like flooding, hard starting, or rough idle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-7201 an OEM part or aftermarket?\u003c\/strong\u003e The 18-7201 is a Sierra-manufactured aftermarket float engineered as a direct equivalent to the original Mercury Marine and OMC float part numbers it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-7201 float have?\u003c\/strong\u003e The float has a machined brass finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat years of GM marine engines use this float?\u003c\/strong\u003e The Sierra 18-7201 fits GM 4.3L and 5.0L marine engines built in the 1979-89 range with the R4 4MV carburetor.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988364964059,"sku":"SIE-18-7201","price":19.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-7201_lg__40192.1558130604.500.750.jpg?v=1785188251","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-brass-carburetor-float-for-rochester-4bbl-replaces-mercury-1397-8546-and-omc-383087-mpn-18-7201","provider":"Good Vibes Marina","version":"1.0","type":"link"}