{"product_id":"mercury-fuel-pump-42725a3","title":"Mercury – Fuel Pump | MerCruiser Sterndrives | 42725A3","description":"\u003cp data-start=\"0\" data-end=\"54\"\u003eMercury – Fuel Pump | MerCruiser Sterndrives | 42725A3\u003c\/p\u003e\n\u003chr data-start=\"56\" data-end=\"59\"\u003e\n\u003ch3 data-start=\"61\" data-end=\"75\"\u003eOverview\u003c\/h3\u003e\n\u003cp data-start=\"76\" data-end=\"649\"\u003eIf you’ve spent any time working on the old 2.5L, 3.0L, or 3.7L MerCruiser sterndrives, you know the mechanical fuel pump is one of those parts that slowly fades rather than suddenly fails. The engine starts getting picky—harder to start, a stumble when you crack the throttle, or it just runs out of breath when you’re trying to get on plane. This pump is the proper replacement for the versions with the filter bowl pointing down. It bolts in the same place, lines up with the stock fittings, and gets fuel moving the way these simple carbureted motors were built to run.\u003c\/p\u003e\n\u003chr data-start=\"651\" data-end=\"654\"\u003e\n\u003ch3 data-start=\"656\" data-end=\"674\"\u003eKey Features\u003c\/h3\u003e\n\u003cp data-start=\"675\" data-end=\"1163\"\u003e • \u003cstrong data-start=\"678\" data-end=\"724\"\u003eBuilt for 2.5L, 3.0L, and 3.7L MerCruisers\u003c\/strong\u003e – Matches the downward-facing bowl setup exactly.\u003cbr data-start=\"774\" data-end=\"777\"\u003e • \u003cstrong data-start=\"780\" data-end=\"804\"\u003eSteady Fuel Pressure\u003c\/strong\u003e – Helps bring back smoother starts and cleaner throttle response.\u003cbr data-start=\"870\" data-end=\"873\"\u003e • \u003cstrong data-start=\"876\" data-end=\"905\"\u003eMarine-Tough Construction\u003c\/strong\u003e – Made to handle bilge heat, vibration, and constant engine shake.\u003cbr data-start=\"972\" data-end=\"975\"\u003e • \u003cstrong data-start=\"978\" data-end=\"1000\"\u003eOEM Fit \u0026amp; Function\u003c\/strong\u003e – No strange threads, no alignment surprises—just a proper match.\u003cbr data-start=\"1066\" data-end=\"1069\"\u003e • \u003cstrong data-start=\"1072\" data-end=\"1104\"\u003eWorks with Stock Filter Bowl\u003c\/strong\u003e – Designed to reuse the original bowl unless it’s damaged.\u003c\/p\u003e\n\u003chr data-start=\"1165\" data-end=\"1168\"\u003e\n\u003ch3 data-start=\"1170\" data-end=\"1203\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/h3\u003e\n\u003cp data-start=\"1204\" data-end=\"1320\"\u003e • MerCruiser 2.5L\u003cbr data-start=\"1222\" data-end=\"1225\"\u003e • MerCruiser 3.0L\u003cbr data-start=\"1243\" data-end=\"1246\"\u003e • MerCruiser 3.7L\u003cbr data-start=\"1264\" data-end=\"1267\"\u003e • Carbureted sterndrives with downward-facing bowl\u003c\/p\u003e\n\u003chr data-start=\"1322\" data-end=\"1325\"\u003e\n\u003ch3 data-start=\"1327\" data-end=\"1365\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/h3\u003e\n\u003cp data-start=\"1366\" data-end=\"1727\"\u003eA healthy pump brings these engines back to life. Cold starts aren’t such a chore, the engine doesn’t fall flat when you throttle up, and it handles chop and turns better because the fuel delivery is steady again. If your boat’s been stumbling or just feeling tired, the pump is often the quiet culprit—and swapping it usually makes the boat feel “right” again.\u003c\/p\u003e\n\u003chr data-start=\"1729\" data-end=\"1732\"\u003e\n\u003ch3 data-start=\"1734\" data-end=\"1751\"\u003eWhy Buy OEM\u003c\/h3\u003e\n\u003cp data-start=\"1752\" data-end=\"2012\"\u003eWith OEM parts, you know the pump will deliver the pressure these engines were designed around. Aftermarket pumps can be hit-or-miss—some run weak, some don’t last long in the heat of a bilge. OEM gives you consistent flow, proper fitment, and fewer headaches.\u003c\/p\u003e\n\u003chr data-start=\"2014\" data-end=\"2017\"\u003e\n\u003ch3 data-start=\"2019\" data-end=\"2028\"\u003eFAQ\u003c\/h3\u003e\n\u003cp data-start=\"2029\" data-end=\"2179\"\u003e\u003cstrong data-start=\"2029\" data-end=\"2088\"\u003eQ1: What are the telltale signs my pump is wearing out?\u003c\/strong\u003e\u003cbr data-start=\"2088\" data-end=\"2091\"\u003e\u003cstrong data-start=\"2091\" data-end=\"2097\"\u003eA:\u003c\/strong\u003e Long cranking, hesitation when you throttle up, or the engine sagging under load.\u003c\/p\u003e\n\u003cp data-start=\"2181\" data-end=\"2317\"\u003e\u003cstrong data-start=\"2181\" data-end=\"2230\"\u003eQ2: Do I need to replace the filter bowl too?\u003c\/strong\u003e\u003cbr data-start=\"2230\" data-end=\"2233\"\u003e\u003cstrong data-start=\"2233\" data-end=\"2239\"\u003eA:\u003c\/strong\u003e Only if it’s cracked or damaged—the pump is made to reuse your original bowl.\u003c\/p\u003e\n\u003cp data-start=\"2319\" data-end=\"2440\"\u003e\u003cstrong data-start=\"2319\" data-end=\"2359\"\u003eQ3: Is this a driveway-friendly job?\u003c\/strong\u003e\u003cbr data-start=\"2359\" data-end=\"2362\"\u003e\u003cstrong data-start=\"2362\" data-end=\"2368\"\u003eA:\u003c\/strong\u003e For most boaters, yes. A few wrenches and patience usually get it done.\u003c\/p\u003e\n\u003cp data-start=\"2442\" data-end=\"2584\"\u003e\u003cstrong data-start=\"2442\" data-end=\"2488\"\u003eQ4: Will I notice a difference right away?\u003c\/strong\u003e\u003cbr data-start=\"2488\" data-end=\"2491\"\u003e\u003cstrong data-start=\"2491\" data-end=\"2497\"\u003eA:\u003c\/strong\u003e Most of the time, absolutely. Carbureted MerCruisers respond quickly to a strong pump.\u003c\/p\u003e\n\u003cp data-start=\"2586\" data-end=\"2689\"\u003e\u003cstrong data-start=\"2586\" data-end=\"2632\"\u003eQ5: Safe to run with ethanol-blended fuel?\u003c\/strong\u003e\u003cbr data-start=\"2632\" data-end=\"2635\"\u003e\u003cstrong data-start=\"2635\" data-end=\"2641\"\u003eA:\u003c\/strong\u003e Yes—this pump is built for modern marine fuels.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46940216590627,"sku":"42725A3","price":266.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV435688_1.jpg?v=1698811888","url":"https:\/\/partsvu.com\/en-mx\/products\/mercury-fuel-pump-42725a3","provider":"PartsVu","version":"1.0","type":"link"}