Mercury – 816296K2 Inline Fuel Filter | Mercury & Mariner Outboards | 5/16-Inch Fuel Line | 816296K2

Overview

Clean fuel makes all the difference in how your outboard runs. The Mercury 816296K2 Inline Fuel Filter helps keep your Mercury or Mariner outboard protected from moisture, rust, and other contaminants that can clog carburetors and steal performance. Designed to fit the 5/16-inch fuel line under the cowl, it’s a simple, transparent filter that gives you both peace of mind and a quick visual check of your fuel quality.

It’s one of those small, easy-to-swap parts that keep your engine happy, smooth, and ready to fire every time you turn the key.

Key Features

• Purpose: Removes dirt, debris, and water from fuel before it reaches the engine.
• Fitment: For select Mercury and Mariner outboards using 5/16-inch fuel lines.
• Design: Inline filter mounts directly under the engine cowl for quick replacement.
• Construction: Clear housing allows easy inspection for contaminants or fuel discoloration.
• OEM Quality: Built to Mercury Marine’s exact flow and filtration standards for reliable protection.

Engine & Boat Compatibility

• Mercury and Mariner 2-stroke and 4-stroke outboards with 5/16-inch fuel lines
• Common on mid-range outboards used on runabouts, skiffs, and fishing boats

Performance & Practical Benefits

The 816296K2 filter keeps fuel clean and flowing freely, which helps your engine start easier, idle smoother, and maintain full power on the water. Over time, even small amounts of debris or water in the fuel can cause hesitation, poor performance, or damage to the carburetor.

The clear casing makes it easy to spot problems before they start — you’ll see any dirt or moisture right through the filter. It’s compact, easy to install, and built to handle the vibration, heat, and humidity that come with real-world marine use.

Why Buy OEM

Mercury’s OEM filters are designed specifically for its fuel systems, providing the right combination of flow rate, filtration, and durability. Aftermarket filters might look similar but often use cheaper materials that don’t hold up under marine heat or ethanol-blended fuels.

A genuine Mercury filter guarantees perfect fitment, consistent flow, and long-lasting reliability. It’s a simple swap that protects your engine from serious wear.

FAQ

Q1: What engines use the Mercury 816296K2 filter?
A: It fits Mercury and Mariner outboards with 5/16-inch fuel lines, commonly found on mid-range motors.

Q2: Where is the filter installed?
A: It sits in-line under the cowl, connected to the 5/16-inch fuel hose.

Q3: How often should it be replaced?
A: Inspect it regularly and replace at least once a season or anytime you see buildup inside the filter.

Q4: Is it ethanol-safe?
A: Yes. The filter is made from ethanol-compatible materials that resist softening or swelling.

Q5: Why OEM instead of a universal filter?
A: Mercury filters maintain the proper flow rate and filtration your outboard needs for smooth operation — something generic filters can’t guarantee.