Mercury – 816296K03 Inline Fuel Filter | 8–15HP FourStroke Mercury & Mariner Outboards | 1/4-Inch Line | 816296K03

Overview

Good fuel is the lifeblood of your engine, and keeping it clean is one of the easiest ways to protect your investment. The Mercury 816296K03 Inline Fuel Filter is designed for Mercury and Mariner 8–15HP FourStroke outboards and installs directly into the ¼-inch fuel line under the cowl. It traps the fine debris, water, and dirt that can sneak into your fuel system and quietly steal horsepower.

This small, clear-bodied filter gives you a quick visual check of fuel quality every time you remove the cowl — a simple, effective layer of protection that keeps your outboard running strong and smooth all season long.

Key Features

• Purpose: Filters fuel to prevent dirt, rust, and water from entering the carburetor or injectors.
• Fitment: For Mercury and Mariner 8–15HP FourStroke outboards (323cc, serial No. 0T003862–1B727495).
• Design: Compact inline filter fits directly into the ¼-inch fuel line under the cowl.
• Construction: Clear housing allows for easy inspection of trapped debris or water.
• OEM Quality: Built to Mercury Marine specifications for flow rate, filtration, and fit.

Engine & Boat Compatibility

• Mercury 8HP, 9.9HP, 15HP FourStroke outboards (323cc)
• Mariner 8HP, 9.9HP, 15HP FourStroke outboards (same series)
• Perfect for small fishing boats, dinghies, and inflatables

Performance & Practical Benefits

The 816296K03 filter keeps your outboard’s carburetor and fuel system clean — the key to smooth starting, steady idle, and reliable throttle response. By catching small contaminants and moisture before they reach the engine, it prevents the clogging and corrosion that often lead to poor performance or hard starts.

The transparent design makes it easy to see when it’s time for a replacement, and its compact shape fits snugly under the cowl without kinking the line. It’s a simple, quick-install solution that provides big peace of mind, especially if you run ethanol-blended fuels or store your boat between trips.

Why Buy OEM

Mercury’s OEM fuel filters are engineered specifically for their outboards — tuned for the right flow, filtration, and pressure balance. Aftermarket filters might fit, but they rarely match Mercury’s standards for durability or consistent flow, and some can even restrict fuel delivery at higher RPMs.

With a genuine Mercury filter, you know your engine’s getting the right amount of clean fuel at the right pressure. It’s a small, affordable safeguard that keeps your outboard performing like new.

FAQ

Q1: Which engines does the Mercury 816296K03 fit?
A: It fits Mercury and Mariner 8–15HP FourStroke outboards (323cc) built within serial numbers 0T003862–1B727495.

Q2: Where is it installed?
A: It installs in-line under the engine cowl, connected to the ¼-inch fuel line.

Q3: How often should I replace it?
A: Check it regularly and replace it at least once per season, or sooner if you see debris or discoloration.

Q4: Can it handle ethanol fuel?
A: Yes. The filter housing and seals are made from ethanol-resistant materials designed for marine fuel systems.

Q5: Why choose OEM instead of a universal filter?
A: Mercury filters are built for the exact pressure and flow your outboard needs, ensuring reliable starts and top performance.