{"product_id":"merc-575","title":"Mercury MerCruiser Fuel Pressure Regulator – Port Side | 885174","description":"\u003ch2\u003eMercury MerCruiser Fuel Pressure Regulator – Port Side | 885174\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 885174  |  \u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury \/ MerCruiser  |  \u003cstrong\u003ePosition:\u003c\/strong\u003e Port-Side Fuel Rail  |  \u003cstrong\u003eUPC:\u003c\/strong\u003e 745061543447\u003c\/p\u003e\n\n\u003cp\u003eGenuine Mercury Marine OEM port-side fuel pressure regulator for selected MerCruiser MPI gasoline sterndrive engines. Mounted directly to the port fuel rail in ECM 555 multi-port injection systems, this regulator maintains the correct fuel pressure delivered to the injectors — a critical factor in clean combustion, fuel economy, and reliable starting across the engine’s operating range.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury Marine OEM replacement regulator\u003c\/li\u003e\n\u003cli\u003ePort-side fuel rail position — ECM 555 MPI fuel injection systems\u003c\/li\u003e\n\u003cli\u003eMaintains correct fuel rail pressure for injector operation\u003c\/li\u003e\n\u003cli\u003eDirect OEM fit — matches original mounting, connections, and sealing configuration\u003c\/li\u003e\n\u003cli\u003eEngineered for marine MPI fuel system demands\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMerCruiser 4.3L MPI — ECM 555 fuel injection system\u003c\/li\u003e\n\u003cli\u003eMerCruiser 5.0L MPI — ECM 555 fuel injection system\u003c\/li\u003e\n\u003cli\u003eMerCruiser 350 MAG MPI \/ 5.7L — ECM 555 fuel injection system\u003c\/li\u003e\n\u003cli\u003eMerCruiser MX 6.2L MPI — ECM 555 fuel injection system\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eConfirm the engine model, serial number, and ECM\/fuel-rail configuration before ordering. MerCruiser used different fuel pressure components across MPI generations — matching by serial number and the applicable fuel-rail parts diagram is the most reliable fitment check.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhen Replacement Is Needed\u003c\/h3\u003e\n\u003cp\u003eA failing fuel pressure regulator may contribute to hard starting, rough idle, hesitation, rich or lean running conditions, or fuel pressure readings outside specification. Perform a fuel pressure test to confirm the fault before replacement.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eRelieve fuel system pressure before beginning service. The regulator mounts to the fuel rail and must be installed with the correct sealing components and retaining hardware. Inspect the rail connection and seals carefully after installation, pressure-test the system, and verify there is no fuel leakage before operating the engine.\u003c\/p\u003e\n\n\u003ch3\u003eCross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury \/ MerCruiser:\u003c\/strong\u003e 885174\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSierra:\u003c\/strong\u003e 18-7662\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMallory:\u003c\/strong\u003e 9-33210\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 745061543447\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003eThis regulator is most commonly needed on MerCruiser 4.3L, 5.0L, 350 MAG, and MX 6.2L MPI engines running the ECM 555 fuel injection system. The best use case is a direct OEM replacement confirmed by a fuel pressure test showing the port-side rail is out of specification. The most common customer issue is ordering without confirming the engine’s serial number range — because MerCruiser used different regulator configurations across MPI generations, matching by serial number and the fuel-rail diagram is essential before ordering.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":51324693282852,"sku":"885174","price":603.97,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/dfded220-b472-488b-8cae-8ee54ce349c9.png?v=1788200857","url":"https:\/\/marisolmarine.com\/products\/merc-575","provider":"Marisol Marine Company","version":"1.0","type":"link"}