Mercury – In-Line Fuel Filter | FourStroke Fuel System | Composite Filter Body | 879885K

Overview

Most of us have had that moment on the water when the engine hesitates just enough to get our attention. It is never a good feeling, especially when you are far from the ramp or easing through unfamiliar water. A good fuel filter is one of those small, quiet guardians that keeps those moments from happening. The Mercury 879885K In-Line Fuel Filter brings a sense of calm to every trip. It keeps your fuel clean, your engine breathing right, and your day on the water running smooth—whether you are pushing toward a distant reef at dawn or cruising with the family at sunset.

Key Features

• In-line filter removes fuel-borne contaminants before they can enter the engine
• Durable composite filter body engineered specifically for marine environments
• Easy-access design simplifies routine maintenance
• Designed for modern FourStroke fuel systems from 30 to 400 horsepower
• Meets Mercury Marine’s original equipment filtration requirements

Engine & Boat Compatibility

• Fits Mercury FourStroke outboards including:
  • 30–40 horsepower EFI
  • 40–60 horsepower EFI
  • 1.7L and 2.1L 75–115 horsepower EFI
  • 150 horsepower EFI
  • L4 Verado
  • L6 Verado
• Commonly used on:
  • Bay boats and inshore skiffs
  • Pontoon and deck boats
  • Aluminum lake boats
  • Family runabouts and sport boats
  • Offshore center consoles powered by Verado engines

Performance & Practical Benefits

A dependable fuel filter is something you feel more than you notice. With the 879885K in place, your outboard settles into a steadier idle, responds more cleanly when you throttle up, and maintains consistent power across the entire run. By keeping water droplets, grit, and microscopic particles out of the fuel system, it protects expensive injectors and internal components over the long haul.

Its in-line placement makes maintenance refreshingly simple. You can see it, reach it, replace it, and get back to the water without crawling deep into the rigging. The filter’s secure fittings create a tight, confident seal that holds up against constant vibration. In rough chop, heavy rain, or the everyday rhythm of rising and falling tides, the filter keeps doing its job—quietly, steadily, and reliably.

This is the kind of part you install once and immediately feel better about—because clean fuel means smoother mornings, easier holeshots, and fewer surprises when you need your engine most.

Why Buy OEM

Talking with seasoned boaters, you will hear the same advice over and over: use the right filter.

• Mercury OEM filters are engineered for the precise pressure and flow requirements of FourStroke systems
• Designed to protect high-pressure EFI and Verado fuel systems
• Long-term value through better protection and fewer fuel-related issues
• Fits exactly as intended—no guessing, no adapting, no leaks
• Built with materials that withstand marine heat, vibration, and moisture

It is simply the most dependable choice when you want your outboard to run the way it was meant to.

FAQ

Q1: Which engines does the 879885K fuel filter fit?

It fits select Mercury FourStroke outboards from 30 horsepower up to 400 horsepower, including Verado models.

Q2: How is this different from aftermarket filters?

OEM filters are engineered for the exact pressure, flow, and filtration requirements of Mercury fuel systems, ensuring proper protection.

Q3: How do I confirm compatibility?

Check your engine’s serial number and consult your owner’s manual. If your FourStroke uses an in-line filter in this location, this is typically the correct match.

Q4: Is it suitable for both saltwater and freshwater?

Yes. It is built for all marine environments and helps guard against moisture intrusion in the fuel supply.

Q5: Is installation straightforward?

Very. The in-line design is easy to access and simple to swap, making maintenance quick for most boat owners.