Mercury – Cartridge Type Fuel Filter Assembly | Under-Cowl Fuel System | Translucent Bowl | 879884T

Overview

There’s a certain comfort that comes from knowing your engine is getting the cleanest fuel possible. When you’re out on the water—chasing the early bite, cruising with the family, or easing through a narrow channel—you don’t want to wonder what’s floating in your fuel lines. The Mercury 879884T Cartridge Type Fuel Filter Assembly brings a sense of steady reliability to every trip. It quietly does its job under the cowl, keeping your outboard fed with clean, dependable fuel so you can focus on the run, the weather, and the simple joy of being afloat.

Key Features

• Twenty-micron filter screens out fuel-borne contaminants before they reach your engine
• Complete under-cowl cartridge filter assembly with element installed
• Translucent bowl allows you to easily see fuel condition, debris, and water separation
• Screw-on bowl design makes filter replacement quick and clean
• Built to Mercury Marine’s exact original-equipment filtration standards

Engine & Boat Compatibility

• Designed for Mercury and Mariner 30- to 60-horsepower three-cylinder and four-cylinder EFI FourStroke outboards
• Fits engines equipped with under-cowl, screw-on style fuel filter bowls
• Commonly found on:
  • Inshore fishing boats
  • Aluminum river and lake boats
  • Pontoon boats
  • Family runabouts
  • Tiller-steer utility rigs

Performance & Practical Benefits

Clean fuel is the foundation of smooth engine performance, and you’ll feel the difference immediately with a proper filter assembly in place. The 879884T traps the fine debris that other filters can miss—rust flakes, water droplets, and the little bits of grime that build up in tanks over time. Once installed, you’ll notice a smoother idle, steadier throttle response, and more consistent power when pushing onto plane.

The translucent bowl is a real-world advantage. With a quick look, you can see if there’s water settling at the bottom or debris beginning to accumulate, giving you early warning before anything becomes a problem. The bowl threads off cleanly for easy filter replacement, and the tight, confident seal helps keep vibration and heat from compromising the system.

This filter assembly is built for the kind of season that starts early, runs long, and sees everything from glass-calm mornings to rough afternoon chop. It’s sturdy, secure, and made for the marine environment—so you can trust it without thinking twice.

Why Buy OEM

Experienced boaters tend to agree: filtration is not the place to gamble.

• Mercury OEM parts are engineered specifically for your engine’s fuel delivery needs
• Proper twenty-micron filtration protects injectors and internal components
• Durable materials withstand marine heat, vibration, and moisture
• Costs less over time by preventing fuel-related repairs and breakdowns
• Installs cleanly and fits exactly as the original part intended

It’s the kind of part you buy once, install with confidence, and count on all season.

FAQ

Q1: Which engines does the 879884T Fuel Filter Assembly fit?

It fits Mercury and Mariner 30- to 60-horsepower EFI FourStroke outboards using under-cowl screw-on filter bowls.

Q2: What makes this filter different from aftermarket versions?

It’s built to Mercury Marine’s precise filtration standards and includes a translucent bowl for real-time fuel visibility.

Q3: How do I confirm it’s the right replacement?

If your outboard uses a screw-on under-cowl fuel filter bowl, this is the direct replacement assembly.

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

Yes. It’s designed for all marine environments and helps guard against moisture-related contamination.

Q5: Is installation simple?

Very. The assembly screws into place, and the bowl removes easily for element replacement.