8M6002988 Mercury MerCruiser Diaphragm Kit | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Air / Fuel Regulator Diaphragm Kit - Part Number: 98-8M6002988

A genuine Quicksilver diaphragm kit used in Mercury OptiMax fuel rail air and fuel regulator assemblies. This diaphragm is used on selected 75HP to 300HP OptiMax / DFI engines, including 3.0L DFI and Jet-powered DFI applications where the fuel rail regulator diagram specifies 98-8M6002988.

⚙️ Key Features

• Genuine Quicksilver OEM diaphragm kit

• Correct Mercury part number 98-8M6002988

• Used in fuel rail air / fuel regulator diaphragm service

• Fits selected Mercury OptiMax / DFI engines where specified

• Includes diaphragm and service instruction material where supplied by Mercury

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 98-8M6002988 current OEM diaphragm kit reference

OEM / Related Numbers:

• 98-8M6002988

• 8M6002988

• Mercury 98-8M6002988

• Quicksilver 98-8M6002988

• Fuel rail diaphragm kit

• Air regulator diaphragm kit

• Fuel regulator diaphragm kit

• OptiMax regulator diaphragm reference

• 889120 related regulator / fuel rail family reference where specified

• 8M0021043 related fuel / water sensor family reference in later service catalogues

Aftermarket / Verified Equivalents:

• Aftermarket fuel rail diaphragm equivalents exist for 8M6002988 applications, but final match must be made by engine serial number and regulator location

🚤 Compatibility

Commonly used on:

• Mercury OptiMax / DFI fuel rail regulator assemblies

• Mercury air regulator and fuel regulator diaphragm service

• Mercury 3.0L DFI, Jet-powered DFI and selected Diesel DSI outboard applications where specified

Typically suits:

• Engine models:

• Mercury 75 DFI / OptiMax applications where 98-8M6002988 is specified

• Mercury 90 DFI / OptiMax applications where 98-8M6002988 is specified

• Mercury 115 DFI / OptiMax applications where 98-8M6002988 is specified

• Mercury 125 DFI / OptiMax applications where 98-8M6002988 is specified

• Mercury 135 DFI / OptiMax applications where 98-8M6002988 is specified

• Mercury 150 DFI / OptiMax applications where 98-8M6002988 is specified

• Mercury 175 DFI / OptiMax applications where 98-8M6002988 is specified

• Mercury 200 DFI / OptiMax 3.0L applications where 98-8M6002988 is specified

• Mercury 225 DFI / OptiMax 3.0L applications where 98-8M6002988 is specified

• Mercury 250 DFI / OptiMax 3.0L applications where 98-8M6002988 is specified

• Mercury 300 DFI / OptiMax 3.0L applications where 98-8M6002988 is specified

• Mercury Jet Powered 3.0L DFI - serial 1E003046 and up where specified

• Mercury 3.0L Diesel DSI - serial 1E052967 and up where specified

• HP Range: commonly 75HP - 300HP where specified

• Engine Type: Mercury OptiMax / DFI and selected Diesel DSI outboard

• System Type: Fuel rail air / fuel pressure regulator diaphragm kit

🔌 Function

The diaphragm separates and controls air or fuel pressure inside the regulator assembly. Correct diaphragm function is essential for stable fuel rail pressure and proper OptiMax fuel delivery.

Common signs of failure:

• Hard starting

• Rough idle or stalling

• Fuel pressure instability

• Poor acceleration or lean / rich running

• Fuel or air leakage at regulator area

• Diaphragm split, hardened or distorted during fuel rail service

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging