Mercury – Fuel System Diaphragm | TwoStroke & Diesel Series | Marine Composite | 8M6002988

Overview

When you spend enough time on the water, you start to appreciate the quiet heroes inside your engine—the parts you never see but depend on every time you push the throttle forward. The Mercury 8M6002988 Diaphragm is one of those unsung essentials. It keeps fuel pressure steady, the combustion cycle balanced, and the whole engine feeling smooth and predictable. That reliability becomes part of the rhythm of your day on the water—whether you’re gliding across a glassy lake at sunrise or running hard through open chop. With a part like this doing its job, you simply enjoy the ride without thinking twice.

Key Features

• Regulates fuel pressure for consistent engine performance
• Durable marine-grade diaphragm built to withstand high heat and vibration
• Includes complete diaphragm assembly and instruction sheet
• Compatible with a wide range of Mercury TwoStroke and Diesel platforms
• Designed and tested to Mercury Marine’s stringent OEM standards
• Material formulated for long service life in harsh marine environments

Engine & Boat Compatibility

The 8M6002988 fits several Mercury outboards, including:

• Mercury OptiMax TwoStroke
  • 1.5L 75–125hp (1B417702–2B112787)
  • 2.5L 115–150hp (0G960500–0T178499)
  • 2.5L 125–175hp (1B736885–2B112787)
  • 3.0L 200–300hp XS and Pro XS (1B504989–2B535571)
• Mercury Diesel
  • 3.0L Diesel DSI (1E052967 and up)
• Jet-Powered Models
  • 3.0L DFI Jet (1E003046 and up)

These engines show up in a wide mix of boats—bass rigs, offshore fishing setups, jet-powered river boats, ski boats, and versatile family craft.

Performance & Practical Benefits

A well-functioning fuel pressure diaphragm may not be glamorous, but the difference it makes on the water is unmistakable. With this genuine Mercury diaphragm installed, you’ll notice:

• Smooth, predictable throttle response, even during rapid acceleration
• A steady fuel supply for cleaner combustion and more reliable ignition
• Better engine stability when trolling, idling, or cruising long distances
• A tight seal and secure fit that holds up under vibration, temperature swings, and constant load
• Reduced risk of fuel delivery issues that can cause hesitation, surging, or hard starts

It is a small component with a big impact—one of those parts you rely on every time you turn the key.

Why Buy OEM

Fuel system components are not where you want to experiment with off-brand substitutes. With OEM parts, you get:

• Exact fitment for your specific Mercury Marine engine
• Materials tested for real-world marine stresses—heat, pressure, moisture, and vibration
• Long-term reliability that helps protect more expensive components downstream
• Peace of mind knowing the part meets Mercury’s engineering and performance requirements
• Cost-effective protection compared to risking premature failure with aftermarket options

When you want the engine to run clean and strong season after season, sticking with genuine Mercury Marine parts is simply the practical choice.

FAQ Section

Q1: Which engines does the 8M6002988 Diaphragm fit?

It fits a range of Mercury OptiMax TwoStroke engines from 75 to 300hp, as well as select Diesel DSI and Jet-Powered DFI outboards.

Q2: What makes this part better than aftermarket alternatives?

OEM parts follow Mercury’s exact performance specifications, ensuring proper sealing, long life, and accurate fuel pressure regulation.

Q3: How do I confirm this is the right replacement?

Match your engine model and serial range with the compatibility list above or refer to your service manual.

Q4: Can it be used in both saltwater and freshwater?

Yes—this diaphragm is engineered to handle corrosion, moisture, and temperature extremes common in all marine environments.

Q5: Is installation straightforward?

Most boat owners with basic tools can install it by following the included instructions, though a technician can handle it quickly as well.