{"product_id":"merc-8","title":"Mercury Carburetor Fuel Pump Diaphragm 16275","description":"\u003ch2\u003eMercury Carburetor Fuel Pump Diaphragm 16275\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 16275\u003cbr\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury \/ Quicksilver\u003cbr\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Carburetor Fuel Pump Diaphragm (OEM)\u003cbr\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Outboard Fuel System \/ Carburetor\u003cbr\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Outer fuel pump diaphragm — beneath pump cover 16272, adjacent to pump cover gasket 16274\u003cbr\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 1 per carburetor\u003cbr\u003e\n\u003cstrong\u003eGTIN \/ UPC:\u003c\/strong\u003e 745061117594\u003cbr\u003e\n\u003cstrong\u003eApproximate Weight:\u003c\/strong\u003e 5 g\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhat This Part Does\u003c\/h3\u003e\n\u003cp\u003eThe 16275 is a genuine OEM fuel pump diaphragm that forms part of the integrated fuel pump section in the carburetor on selected small Mercury and Mariner 2-stroke outboards. It sits directly beneath pump cover 16272 alongside pump cover gasket 16274 and works with the second diaphragm 16325 deeper in the same assembly to draw fuel from the tank and deliver it to the carburetor float bowl. A cracked, hardened, or torn diaphragm causes weak or inconsistent fuel delivery.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNote: 16275 is the outer (upper) diaphragm. A separate second diaphragm, 16325, occupies a different position in the same fuel pump section — they are not interchangeable and both should be inspected whenever the pump cover is removed.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cp\u003eConfirm your engine horsepower, serial number, and carburetor diagram before ordering. Mercury used several carburetor versions across these horsepower ranges.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMercury \/ Mariner 4 HP 2-stroke\u003c\/li\u003e\n\u003cli\u003eMercury \/ Mariner 5 HP 2-stroke (multiple serial ranges)\u003c\/li\u003e\n\u003cli\u003eMercury \/ Mariner 6 HP 2-cylinder 2-stroke\u003c\/li\u003e\n\u003cli\u003eMercury \/ Mariner 8 HP 2-cylinder 2-stroke\u003c\/li\u003e\n\u003cli\u003eMercury \/ Mariner 8 HP SeaPro 2-stroke\u003c\/li\u003e\n\u003cli\u003eMercury \/ Mariner 9.8 HP 2-stroke\u003c\/li\u003e\n\u003cli\u003eMercury \/ Mariner 9.8 HP SeaPro 2-stroke\u003c\/li\u003e\n\u003cli\u003eMercury \/ Mariner 9.9 HP 2-cylinder 2-stroke\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSerial Number Notice\u003c\/h3\u003e\n\u003cp\u003eDo not order by position description alone — confirm against the Mercury carburetor diagram for your engine serial number. Within the same fuel pump section, do not confuse:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e16275 — Outer fuel pump diaphragm (this part)\u003c\/li\u003e\n\u003cli\u003e16325 — Second (inner) pump diaphragm — different position, not interchangeable\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167577473060\"\u003e16274 — Pump cover gasket\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e16326 — Pump body gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFuel delivery is weak or inconsistent and pump section is being diagnosed\u003c\/li\u003e\n\u003cli\u003eDiaphragm is hardened, torn, warped, or shows fuel damage on inspection\u003c\/li\u003e\n\u003cli\u003eDiaphragm has lost flexibility when tested by feel\u003c\/li\u003e\n\u003cli\u003eCarburetor fuel pump rebuild is being performed\u003c\/li\u003e\n\u003cli\u003ePump cover is removed and existing diaphragm shows any deterioration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall 16275 in the exact orientation shown in the Mercury carburetor diagram for your engine model\u003c\/li\u003e\n\u003cli\u003eWhile the assembly is open, inspect the adjacent \u003ca href=\"\/products\/11167577473060\"\u003epump cover gasket 16274\u003c\/a\u003e, second diaphragm 16325, pump body gasket 16326, pump body 16268, and check valve 16269\u003c\/li\u003e\n\u003cli\u003eDo not reuse the old diaphragm after removal — a diaphragm that appeared intact on the bench often fails under fuel pressure and heat cycles\u003c\/li\u003e\n\u003cli\u003eCheck for fuel delivery and signs of leaks after reassembly and before returning the engine to service\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePart Number Cross-Reference\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e 16275\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssociated carburetor repair kit:\u003c\/strong\u003e 855546A1 (includes 16275 as a component — useful reference for a full carburetor overhaul)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e Order 16275 when rebuilding the carburetor fuel pump section on a 4–9.9 HP Mercury or Mariner 2-stroke — replacing both diaphragms (16275 and 16325) and the pump cover gasket (16274) at the same time is the right approach since access is already there and the parts are low cost relative to a repeat fuel delivery issue.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon issues:\u003c\/strong\u003e The most frequent mistake is ordering only one diaphragm when two are used in the same pump section — 16275 is the outer diaphragm and 16325 is the inner diaphragm. Both should be replaced during any pump rebuild. A second common issue is skipping diaphragm replacement during carburetor cleaning — a diaphragm that looks fine when cold often shows cracks or loss of flexibility once it’s been back under fuel and heat, causing the same fuel delivery symptoms to return.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167577473060\"\u003eMercury Carburetor Fuel Pump Cover Gasket 27-16274\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167577407524\"\u003eMercury Carburetor Float Bowl O-Ring 25-16259\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131646390308\"\u003eSierra Marine Fuel Pump 18-7278 — Mercury \/ Mariner 4–15 HP 2-Stroke\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":51324676669476,"sku":"16275","price":26.5,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/5f3bfc56-3741-4f9f-a3cd-9d2a60f049ea.png?v=1788663368","url":"https:\/\/marisolmarine.com\/products\/merc-8","provider":"Marisol Marine Company","version":"1.0","type":"link"}