{"product_id":"mercury-fuel-pump-assembly-861155a3","title":"Mercury Fuel Pump Assembly – 861155A3","description":"\u003cp data-end=\"427\" data-start=\"78\"\u003eMercury MerCruiser Quicksilver 861155A3 is a genuine OEM low-pressure electric fuel pump assembly used on select MerCruiser sterndrive and inboard fuel systems. Mercury describes it as a low-pressure boost pump kit that includes the pump, lead wires with multi-pin connector, and fittings. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"443\" data-start=\"429\"\u003eKey Features\u003c\/p\u003e\n\u003cul data-end=\"832\" data-start=\"444\"\u003e\n\u003cli data-end=\"495\" data-start=\"444\"\u003eGenuine Mercury MerCruiser Quicksilver OEM part\u003c\/li\u003e\n\u003cli data-end=\"546\" data-start=\"496\"\u003eLow-pressure electric fuel boost pump assembly\u003c\/li\u003e\n\u003cli data-end=\"619\" data-start=\"547\"\u003eKit includes pump, lead wires with multi-pin connector, and fittings\u003c\/li\u003e\n\u003cli data-end=\"713\" data-start=\"620\"\u003eCommonly described as a low-pressure pump for select sterndrive and inboard installations\u003c\/li\u003e\n\u003cli data-end=\"832\" data-start=\"714\"\u003eOEM-threaded low-pressure pump assembly. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1401\" data-start=\"834\"\u003eEngine Compatibility\u003cbr data-end=\"857\" data-start=\"854\"\u003eCurrent public listings consistently tie 861155A3 to select MerCruiser sterndrive and inboard applications. Multiple sources specifically list use on MCM\/MIE 4.3L, 5.0L Gen+, and 5.7L Gen+ carbureted applications, and also note boost-pump use on some MPI applications including 5.0L MPI, 350 Mag MPI, MX 6.2L MPI, and 496 Mag \/ 8.1S families. Because listings vary by fuel-system layout, fitment should still be confirmed by engine serial number and the installed fuel-system configuration before ordering. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"1776\" data-start=\"1403\"\u003eSerial Number Fitment Notice\u003cbr data-end=\"1434\" data-start=\"1431\"\u003eFitment should be confirmed by engine serial number and fuel-system configuration, not by engine family alone. This pump is used across multiple MerCruiser applications, and correct use depends on whether the engine is using it as a primary low-pressure pump or as a boost pump in the matched OEM system. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"2236\" data-start=\"1778\"\u003eWhen This Part Needs Replacement\u003cbr data-end=\"1813\" data-start=\"1810\"\u003eReplace when the fuel pump becomes noisy, fails to prime, delivers inconsistent fuel pressure, causes hard starting, stalling, hesitation, or shows leakage or connector damage. Because this is a low-pressure fuel-delivery component, weak output can lead to poor fuel supply and driveability problems. The low-pressure role is directly supported by current OEM and OEM-focused listings. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"2701\" data-start=\"2238\"\u003eInstallation Notes\u003cbr data-end=\"2259\" data-start=\"2256\"\u003eInstall only on the correct MerCruiser application and verify the replacement matches the existing pump style, fittings, connector, and system role. Public listings describe this as a low-pressure pump assembly and note it includes connector leads and fittings; one current source also notes it should not be used in EFI fuel-cooler applications, so application confirmation is important before ordering. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"2740\" data-start=\"2703\"\u003eAlternate \/ Superseded Part Numbers\u003c\/p\u003e\n\u003cul data-end=\"2901\" data-start=\"2741\"\u003e\n\u003cli data-end=\"2753\" data-start=\"2741\"\u003e861155A3\u003c\/li\u003e\n\u003cli data-end=\"2766\" data-start=\"2754\"\u003e861155A2\u003c\/li\u003e\n\u003cli data-end=\"2785\" data-start=\"2767\"\u003eSierra 18-8868\u003c\/li\u003e\n\u003cli data-end=\"2806\" data-start=\"2786\"\u003eSierra 18-8868-1\u003c\/li\u003e\n\u003cli data-end=\"2826\" data-start=\"2807\"\u003eMallory 9-35432\u003c\/li\u003e\n\u003cli data-end=\"2845\" data-start=\"2827\"\u003eEMP 1397-97000\u003c\/li\u003e\n\u003cli data-end=\"2901\" data-start=\"2846\"\u003ePro Marine 1155 \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"3345\" data-start=\"2903\"\u003eParts Desk Insight\u003cbr data-end=\"2924\" data-start=\"2921\"\u003eThe key detail on 861155A3 is that it is a \u003cstrong data-end=\"2983\" data-start=\"2967\"\u003elow-pressure\u003c\/strong\u003e fuel pump, not a generic electric pump. That matters because MerCruiser used it in more than one fuel-system role, and several listings show both carbureted primary-pump use and boost-pump use on certain MPI setups. Matching by serial number and existing pump layout is the safest way to avoid ordering the wrong fuel pump. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"3402\" data-start=\"3347\"\u003eShips same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43986319605796,"sku":"861155A3","price":1005.28,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/18603d44-dae0-4824-9f07-7c031f999200.png?v=1775535335","url":"https:\/\/marisolmarine.com\/products\/mercury-fuel-pump-assembly-861155a3","provider":"Marisol Marine Company","version":"1.0","type":"link"}