Mercury – Quicksilver 816856Q3 Quick Disconnect Fuel Line Connector | 5/16-Inch Hose | Mercury & Mariner Outboards | 816856Q3

Overview

Few things are more frustrating than fighting a leaky or loose fuel line when you’re ready to head out. The Quicksilver 816856Q3 Quick Disconnect Fuel Line Connector fixes that for good. Designed for Mercury and Mariner outboards, it provides a tight, secure clip-on connection between your engine and a 5/16-inch (8mm) fuel line.

It’s made from tough, marine-grade materials that stand up to heat, fuel, and salt. The quick-connect design makes it easy to attach or remove the line without tools — simple, clean, and reliable, just the way a good fuel fitting should be.

Key Features

• Purpose: Creates a secure, leak-free connection between your engine and fuel line.
• Fitment: Works with Mercury and Mariner outboards using a 5/16-inch (8mm) inside diameter fuel line.
• What’s Included: One fuel connector fitting and a hose clamp for easy installation.
• Ease of Use: Quick clip-on design lets you connect or disconnect the line in seconds.
• Built to Last: Made from corrosion-resistant materials that hold up to marine fuel and salt exposure.

Engine & Boat Compatibility

• All Mercury and Mariner outboard motors with clip-on style quick disconnect fittings
• Works with 5/16-inch (8mm) fuel lines
• Ideal for small fishing boats, runabouts, or inflatables

Performance & Practical Benefits

A clean, tight fuel connection means smoother starts and steadier fuel delivery. The 816856Q3 connector eliminates the small air leaks and fuel drips that can cause rough running or hard starting. It seals firmly to the engine fitting and releases easily when you’re ready to disconnect the line for storage or maintenance.

You’ll notice better consistency at startup and peace of mind knowing you’re not losing fuel or air pressure in the line. It’s a simple upgrade that keeps your outboard dependable and your setup looking clean.

Why Buy OEM

Mercury’s OEM fuel fittings are made to the same specs as the ones installed at the factory. They’re designed for perfect flow and fit, tested for real-world marine conditions, and built to last season after season.

Cheaper aftermarket connectors might fit, but the materials often soften or wear, leading to leaks. A genuine Quicksilver connector guarantees a snug seal, smooth flow, and long-term reliability — no leaks, no guesswork, just solid performance.

FAQ

Q1: What engines use this connector?
A: It fits Mercury and Mariner outboards designed for clip-on quick disconnect fittings.

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

Q3: What’s included in the kit?
A: One fuel connector fitting and one hose clamp.

Q4: Is it easy to install?
A: Very. Just slide it onto your fuel line and secure it with the clamp — no special tools required.

Q5: Why choose OEM instead of aftermarket?
A: OEM connectors fit better, seal tighter, and last longer. Aftermarket fittings can loosen or corrode quickly in marine conditions.