{"product_id":"mercury-diaphragm-assy-804533","title":"Mercury – Quicksilver Diaphragm Assembly | For 110–300HP DFI OptiMax Outboards | 804533","description":"\u003cp data-start=\"0\" data-end=\"93\"\u003e\u003cstrong data-start=\"0\" data-end=\"91\"\u003eMercury – Quicksilver Diaphragm Assembly | For 110–300HP DFI OptiMax Outboards | 804533\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"95\" data-end=\"98\"\u003e\n\u003ch3 data-start=\"100\" data-end=\"118\"\u003e\u003cstrong data-start=\"104\" data-end=\"116\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"119\" data-end=\"604\"\u003eYour fuel system’s performance depends on precision parts, and the \u003cstrong data-start=\"186\" data-end=\"230\"\u003eMercury Marine 804533 Diaphragm Assembly\u003c\/strong\u003e keeps your OptiMax outboard delivering smooth, consistent power. Built for \u003cstrong data-start=\"306\" data-end=\"356\"\u003eMercury 110–300HP DFI OptiMax 2-Stroke engines\u003c\/strong\u003e, this OEM diaphragm is designed for use within the fuel rail, maintaining proper fuel pressure and flow. It’s a small but vital part that helps your engine start cleanly, run efficiently, and perform reliably — even after long days on the water.\u003c\/p\u003e\n\u003chr data-start=\"606\" data-end=\"609\"\u003e\n\u003ch3 data-start=\"611\" data-end=\"633\"\u003e\u003cstrong data-start=\"615\" data-end=\"631\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"636\" data-end=\"741\"\u003e\n\u003cstrong data-start=\"636\" data-end=\"648\"\u003ePurpose:\u003c\/strong\u003e Maintains correct fuel pressure and flow inside the fuel rail for smooth engine operation.\u003c\/li\u003e\n\u003cli data-start=\"744\" data-end=\"837\"\u003e\n\u003cstrong data-start=\"744\" data-end=\"755\"\u003eDesign:\u003c\/strong\u003e Precision-engineered to Mercury’s factory standards for balance and durability.\u003c\/li\u003e\n\u003cli data-start=\"840\" data-end=\"944\"\u003e\n\u003cstrong data-start=\"840\" data-end=\"857\"\u003eConstruction:\u003c\/strong\u003e Made from \u003cstrong data-start=\"868\" data-end=\"895\"\u003emarine-tested materials\u003c\/strong\u003e that resist fuel degradation and ethanol wear.\u003c\/li\u003e\n\u003cli data-start=\"947\" data-end=\"1037\"\u003e\n\u003cstrong data-start=\"947\" data-end=\"963\"\u003ePerformance:\u003c\/strong\u003e Ensures stable combustion, smooth acceleration, and reduced fuel waste.\u003c\/li\u003e\n\u003cli data-start=\"1040\" data-end=\"1127\"\u003e\n\u003cstrong data-start=\"1040\" data-end=\"1056\"\u003eEase of Use:\u003c\/strong\u003e OEM part for direct replacement — no modifications or tuning needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1129\" data-end=\"1132\"\u003e\n\u003ch3 data-start=\"1134\" data-end=\"1171\"\u003e\u003cstrong data-start=\"1138\" data-end=\"1169\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1174\" data-end=\"1228\"\u003e\u003cstrong data-start=\"1174\" data-end=\"1226\"\u003eMercury 110–300HP DFI OptiMax 2-Stroke outboards\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1230\" data-end=\"1233\"\u003e\n\u003ch3 data-start=\"1235\" data-end=\"1278\"\u003e\u003cstrong data-start=\"1239\" data-end=\"1276\"\u003ePerformance \u0026amp; Real-World Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1279\" data-end=\"1594\"\u003eThe \u003cstrong data-start=\"1283\" data-end=\"1312\"\u003e804533 diaphragm assembly\u003c\/strong\u003e plays a key role in how your OptiMax delivers power. Over time, diaphragms can stiffen or crack due to constant pressure changes and exposure to fuel. Replacing it restores steady fuel flow and helps prevent issues like hard starts, poor throttle response, or inconsistent power.\u003c\/p\u003e\n\u003cp data-start=\"1596\" data-end=\"1829\"\u003eIt’s a simple part that makes a big difference in overall reliability. By maintaining the right balance of pressure within the fuel rail, this OEM diaphragm keeps your engine running strong, efficient, and dependable on every trip.\u003c\/p\u003e\n\u003chr data-start=\"1831\" data-end=\"1834\"\u003e\n\u003ch3 data-start=\"1836\" data-end=\"1868\"\u003e\u003cstrong data-start=\"1840\" data-end=\"1866\"\u003eWhy Choose Mercury OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1869\" data-end=\"2140\"\u003eThe \u003cstrong data-start=\"1873\" data-end=\"1891\"\u003eMercury 804533\u003c\/strong\u003e is a \u003cstrong data-start=\"1897\" data-end=\"1921\"\u003egenuine factory part\u003c\/strong\u003e, built to handle the specific pressures and heat cycles of the DFI OptiMax fuel system. Aftermarket replacements might look similar, but they often can’t match Mercury’s precision or resistance to modern fuel blends.\u003c\/p\u003e\n\u003cp data-start=\"2142\" data-end=\"2410\"\u003eMercury’s OEM diaphragms are lab- and field-tested under marine conditions to ensure consistent fuel delivery and long service life. When it comes to the heart of your fuel system, using OEM ensures you’re running with the same reliability your engine was built for.\u003c\/p\u003e\n\u003chr data-start=\"2412\" data-end=\"2415\"\u003e\n\u003ch3 data-start=\"2417\" data-end=\"2430\"\u003e\u003cstrong data-start=\"2421\" data-end=\"2428\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2432\" data-end=\"2564\"\u003e\u003cstrong data-start=\"2432\" data-end=\"2463\"\u003eQ1: What does this part do?\u003c\/strong\u003e\u003cbr data-start=\"2463\" data-end=\"2466\"\u003eIt regulates fuel pressure within the fuel rail, ensuring the injectors receive consistent flow.\u003c\/p\u003e\n\u003cp data-start=\"2566\" data-end=\"2665\"\u003e\u003cstrong data-start=\"2566\" data-end=\"2599\"\u003eQ2: What engines does it fit?\u003c\/strong\u003e\u003cbr data-start=\"2599\" data-end=\"2602\"\u003eIt fits \u003cstrong data-start=\"2610\" data-end=\"2662\"\u003eMercury 110–300HP DFI OptiMax 2-Stroke outboards\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"2667\" data-end=\"2806\"\u003e\u003cstrong data-start=\"2667\" data-end=\"2701\"\u003eQ3: Why replace the diaphragm?\u003c\/strong\u003e\u003cbr data-start=\"2701\" data-end=\"2704\"\u003eOver time, it can harden or crack, causing fuel delivery issues and inconsistent engine performance.\u003c\/p\u003e\n\u003cp data-start=\"2808\" data-end=\"2936\"\u003e\u003cstrong data-start=\"2808\" data-end=\"2845\"\u003eQ4: Is this a direct replacement?\u003c\/strong\u003e\u003cbr data-start=\"2845\" data-end=\"2848\"\u003eYes — it’s an \u003cstrong data-start=\"2862\" data-end=\"2874\"\u003eOEM part\u003c\/strong\u003e designed for perfect fit and function with no modification.\u003c\/p\u003e\n\u003cp data-start=\"2938\" data-end=\"3097\"\u003e\u003cstrong data-start=\"2938\" data-end=\"2961\"\u003eQ5: Why choose OEM?\u003c\/strong\u003e\u003cbr data-start=\"2961\" data-end=\"2964\"\u003eMercury’s OEM diaphragms are \u003cstrong data-start=\"2993\" data-end=\"3034\"\u003eprecision-engineered and ethanol-safe\u003c\/strong\u003e, giving you long-term durability and consistent performance.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626558742819,"sku":"804533","price":162.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/804533_main-1.jpg?v=1760631202","url":"https:\/\/partsvu.com\/en-au\/products\/mercury-diaphragm-assy-804533","provider":"PartsVu","version":"1.0","type":"link"}