Mercury – Quicksilver 816856T3 Quick-Disconnect Fuel Line Connector Kit | Vintage Mercury & Mariner Outboards | 5/16-Inch Line | 816856T3

Overview

If you run an older Mercury or Mariner outboard, this part is one of those simple upgrades that just makes life easier. The Mercury 816856T3 Quick-Disconnect Fuel Line Connector Kit gives vintage engines a solid, no-leak connection where the fuel line meets the motor.

It’s made from cast aluminum, not plastic, so it’s tough enough to handle years of heat, vibration, and salt spray. It clips right on to any 5/16-inch (8mm) fuel line using Mercury’s classic quick-disconnect design. Once you install it, you’ll have a cleaner, safer fuel hookup every time you head out.

Key Features

• Purpose: Replaces worn or loose fuel fittings to stop leaks and keep fuel flow steady.
• Fitment: For vintage Mercury and Mariner outboards with 5/16-inch (8mm) quick-disconnect fuel lines.
• Construction: Heavy-duty cast aluminum body for strength and corrosion resistance.
• Easy Install: Slips onto the hose and locks in place with the included clamp.
• What’s Included: One fuel connector fitting and one hose clamp.

Engine & Boat Compatibility

• Older Mercury and Mariner outboards using clip-on style fuel fittings
• Works with standard 5/16-inch (8mm) fuel lines
• Great for vintage fishing boats, skiffs, or restorations

Performance & Practical Benefits

The 816856T3 connector keeps your fuel system sealed tight. No air leaks, no dripping fuel, just steady flow to your carburetor or injectors. The quick-connect design means you can pop the line off for storage or service in seconds — no tools, no fuss.

Because it’s aluminum, it won’t soften, swell, or crack like plastic fittings can after a few seasons. The fit is snug and reliable, so you’ll spend less time checking for leaks and more time actually enjoying your boat.

Why Buy OEM

Mercury’s OEM parts are built for the job. The tolerances are exact, and the materials are chosen for marine life — not borrowed from automotive parts. Cheap knock-offs may look similar but often loosen, corrode, or restrict flow.

A genuine Quicksilver connector gives you factory-level confidence every time you hook up your fuel line. It’s the kind of small part that quietly keeps everything working right.

FAQ

Q1: What engines fit this kit?
A: Any vintage Mercury or Mariner outboard that uses the clip-on quick-disconnect fuel fitting.

Q2: What fuel line size does it fit?
A: It’s made for 5/16-inch (8mm) inside-diameter lines.

Q3: What comes in the package?
A: One cast aluminum fuel connector and one hose clamp.

Q4: How do I install it?
A: Slide it onto the hose, tighten the clamp, and clip it onto your outboard’s fuel fitting — that’s it.

Q5: Why OEM?
A: Mercury’s connectors are machined to seal perfectly and built from corrosion-resistant metal. Aftermarket parts can warp or leak.