{"product_id":"merc-120","title":"Mercury Fuel Pump Diaphragm 31503A1","description":"\u003cp\u003eMercury MerCruiser Quicksilver \u003cstrong\u003e31503A1\u003c\/strong\u003e is a genuine Mercury Marine fuel pump diaphragm used in select older Mercury outboard fuel pump assemblies. Mercury parts references identify the earlier \u003cstrong\u003e31503\u003c\/strong\u003e as \u003cstrong\u003eDIAPHRAGM, FUEL PUMP TO GASKET\u003c\/strong\u003e, with \u003cstrong\u003e31503A1\u003c\/strong\u003e shown as the current functional replacement. This diaphragm is used inside the fuel pump assembly to help maintain proper fuel-pump operation on supported applications.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury Marine \/ Quicksilver diaphragm reference\u003c\/li\u003e\n\u003cli\u003eFuel pump diaphragm \/ fuel pump-to-gasket sealing component\u003c\/li\u003e\n\u003cli\u003eUsed in supported older Mercury outboard fuel pump assemblies\u003c\/li\u003e\n\u003cli\u003eCurrent Mercury reference: \u003cstrong\u003e31503A1\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEarlier reference: \u003cstrong\u003e31503\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eGTIN \/ UPC reference: \u003cstrong\u003e745061075283\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCatalog package reference: approximately \u003cstrong\u003e4.50 in. x 4.50 in. x 0.20 in.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCatalog weight reference: approximately \u003cstrong\u003e0.01 lb\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis diaphragm is shown in Mercury parts references for select older Mercury outboard fuel pump assemblies, including \u003cstrong\u003eMercury 60\u003c\/strong\u003e, \u003cstrong\u003eMercury Merc 110 \/ 9.8\u003c\/strong\u003e, and \u003cstrong\u003e39 \/ 40 HP 1-cylinder\u003c\/strong\u003e applications depending on serial number range and fuel pump assembly. Supporting application data also associates \u003cstrong\u003e31503A1\u003c\/strong\u003e with Mercury 3.9 \/ 1-cylinder and Mercury 60 fuel pump assembly references by serial range.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFuel pump diaphragm fitment depends on the exact outboard model, fuel pump assembly, and serial number range. Always confirm compatibility using the Mercury serial number and parts diagram before ordering, especially where older references such as \u003cstrong\u003e31503\u003c\/strong\u003e or \u003cstrong\u003e30652\u003c\/strong\u003e have been replaced by \u003cstrong\u003e31503A1\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace this diaphragm if the fuel pump is leaking, the diaphragm is stiff, torn, swollen, cracked, fuel-soaked, or no longer allowing the pump to operate correctly. Fuel delivery issues such as hard starting, poor running, hesitation, or loss of power should be diagnosed before replacement to confirm the fuel pump is the problem.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eService the fuel pump on a clean bench and note the order of the diaphragm, gasket, spring, and related parts during disassembly. Inspect the fuel pump body for warping, corrosion, debris, or check-valve issues before reassembly. Use the Mercury service manual procedure for the exact engine and confirm the diaphragm is seated correctly before tightening the pump hardware.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e31503A1\u003c\/li\u003e\n\u003cli\u003e31503A-1\u003c\/li\u003e\n\u003cli\u003e31503\u003c\/li\u003e\n\u003cli\u003e30652\u003c\/li\u003e\n\u003cli\u003eMercury Marine 31503A1\u003c\/li\u003e\n\u003cli\u003eQuicksilver 31503A1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis is an older Mercury fuel pump service part, so serial number matching matters. The part may be listed simply as a diaphragm, but the safe match is the exact fuel pump assembly diagram, especially on older Mercury outboards where similar fuel pump parts can look alike.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563851218980,"sku":"31503A1","price":14.85,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/6bdf7e05-227f-4b75-94dd-098935df3d5a.png?v=1777590427","url":"https:\/\/marisolmarine.com\/products\/merc-120","provider":"Marisol Marine Company","version":"1.0","type":"link"}