{"product_id":"3h9-70311-0-fuel-tap-cock-switch-for-tohatsu-mercury-mfs4a2-mfs4b-mfs4c-mfs5a2-mfs5b-mfs5c-mfs6a2-mfs6b-mfs6c-jlm-marine","title":"3H9-70311-0 Fuel Tap Cock Switch for Tohatsu Mercury MFS4A2 MFS4B MFS4C MFS5A2 MFS5B MFS5C MFS6A2 MFS6B MFS6C | JLM Marine","description":"\u003ch2\u003eFuel Tap Cock Switch – Fits Tohatsu Mercury 4HP 5HP 6HP Outboard Motors\u003c\/h2\u003e\n\n\u003cp\u003eThis fuel tap cock switch is designed for Tohatsu and Mercury 4-stroke outboard engines ranging from 4HP to 6HP. It provides reliable fuel flow control for your engine, ensuring smooth operation and easy maintenance. Compatible with multiple engine series including MFS4A2, MFS4B, MFS4C, MFS5A2, MFS5B, MFS5C, MFS6A2, MFS6B, and MFS6C models.\u003c\/p\u003e\n\n\u003cp\u003eThis switch directly replaces OEM part number \u003cstrong\u003e3H9-70311-0\u003c\/strong\u003e and its variants, delivering dependable performance for your outboard motor's fuel system.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003ePrecision-engineered for Tohatsu and Mercury 4-stroke outboards\u003c\/li\u003e\n\u003cli\u003eDirect replacement for OEM fuel cock assembly\u003c\/li\u003e\n\u003cli\u003eEssential component for fuel system control and maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3H9-70311-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3H9703110\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3H9703110M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS4A2\u003c\/td\u003e\n\u003ctd\u003e4HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS4B\u003c\/td\u003e\n\u003ctd\u003e4HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS4C\u003c\/td\u003e\n\u003ctd\u003e4HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS5A2\u003c\/td\u003e\n\u003ctd\u003e5HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS5B\u003c\/td\u003e\n\u003ctd\u003e5HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS5C\u003c\/td\u003e\n\u003ctd\u003e5HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS6A2\u003c\/td\u003e\n\u003ctd\u003e6HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS6B\u003c\/td\u003e\n\u003ctd\u003e6HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS6C\u003c\/td\u003e\n\u003ctd\u003e6HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMFS4A2\u003c\/td\u003e\n\u003ctd\u003e4HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMFS4B\u003c\/td\u003e\n\u003ctd\u003e4HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMFS4C\u003c\/td\u003e\n\u003ctd\u003e4HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMFS5A2\u003c\/td\u003e\n\u003ctd\u003e5HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMFS5B\u003c\/td\u003e\n\u003ctd\u003e5HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMFS5C\u003c\/td\u003e\n\u003ctd\u003e5HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMFS6A2\u003c\/td\u003e\n\u003ctd\u003e6HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMFS6B\u003c\/td\u003e\n\u003ctd\u003e6HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMFS6C\u003c\/td\u003e\n\u003ctd\u003e6HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Type\u003c\/td\u003e\n\u003ctd\u003eFuel Tap Cock Switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e3H9-70311-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eTohatsu, Mercury\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Type\u003c\/td\u003e\n\u003ctd\u003e4-Stroke Outboard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHorsepower Range\u003c\/td\u003e\n\u003ctd\u003e4HP - 6HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eYour package includes:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e1 × Fuel Cock Assy Switch\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eEnsure the engine is completely off and cool before beginning work. Disconnect the fuel line from the existing fuel cock assembly.\u003c\/li\u003e\n\u003cli\u003eRemove the mounting screws or fasteners securing the old fuel tap cock switch to the engine. Carefully extract the old unit.\u003c\/li\u003e\n\u003cli\u003eInspect the mounting surface and fuel line connections for debris or damage. Clean as necessary to ensure proper seal.\u003c\/li\u003e\n\u003cli\u003ePosition the new fuel tap cock switch in the correct orientation, aligning the fuel inlet and outlet ports with your fuel lines.\u003c\/li\u003e\n\u003cli\u003eSecure the new switch using the original mounting hardware or provided fasteners. Tighten evenly to manufacturer specifications.\u003c\/li\u003e\n\u003cli\u003eReconnect the fuel line to the new fuel cock assembly, ensuring all connections are snug and leak-free.\u003c\/li\u003e\n\u003cli\u003eTurn the fuel cock to the \"ON\" position and check for any fuel leaks around the connections and mounting points.\u003c\/li\u003e\n\u003cli\u003eStart the engine and let it run for a few minutes while monitoring for proper fuel flow and any signs of leakage.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this fuel tap cock switch fits my Tohatsu or Mercury outboard?\u003c\/strong\u003e\u003cbr\u003e\nA: Check the Compatible Engine Models table above for your specific model number (e.g., MFS4B, MFS5C, MFS6A2). Also verify that your original part number matches 3H9-70311-0, 3H9703110, or 3H9703110M to ensure compatibility.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my fuel cock switch needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include fuel leaks around the switch assembly, difficulty turning the fuel valve, inconsistent fuel flow to the engine, or visible cracks and wear on the switch body. If you notice any of these issues, replacement is recommended.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I inspect or replace this fuel tap cock switch?\u003c\/strong\u003e\u003cbr\u003e\nA: Inspect the fuel cock switch annually as part of your regular outboard maintenance routine. Replace it immediately if you notice any leaks, cracks, or operational issues, or every 5-7 years as a preventive measure depending on usage and exposure to the elements.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I install this switch myself or do I need a professional?\u003c\/strong\u003e\u003cbr\u003e\nA: Installation is straightforward for those with basic mechanical skills and tools. However, because it involves fuel system components, professional installation is recommended to ensure proper sealing and safety, especially if you're unfamiliar with outboard fuel systems.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or aftermarket replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51980999295289,"sku":"23FF160","price":34.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/6666192386.jpg?v=1772414066","url":"https:\/\/jlmmarine.com\/products\/3h9-70311-0-fuel-tap-cock-switch-for-tohatsu-mercury-mfs4a2-mfs4b-mfs4c-mfs5a2-mfs5b-mfs5c-mfs6a2-mfs6b-mfs6c-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}