Mercury – Fuel Filter, 15 Micron | Fuel System | 35-866171A01

Overview

On MerCruiser engines running the Gen III fuel cooler, this 15-micron filter is one of those parts that quietly keeps things running right. When it starts getting clogged, the engine usually gives you little hints—maybe it falls on its face when you throttle up, maybe cruise speed feels softer than usual, or the motor just doesn’t respond the way you expect. Swapping in the proper OEM filter brings the fuel system back in line and keeps water and fine debris from slipping past the cooler.

Key Features

 • 15-Micron Filtration – Grabs the small stuff that can mess with injectors and pumps.
 • High Efficiency (95%) – Cleans the fuel as it passes through the cooler chamber.
 • Tough Multi-Fiber Media – Polyester, cellulose, and glass fiber bonded for durability.
 • For Gen III Fuel Coolers – Correct element for 2004+ MerCruiser sterndrive and inboard setups.
 • OEM-Spec Build – Designed to seal right and flow properly in Mercury’s system.

Engine & Boat Compatibility

 • MerCruiser sterndrives (Gen III)
 • MerCruiser inboards (Gen III)
 • 2004 and newer cooler-equipped engines

Performance & Practical Benefits

A fresh filter can make the engine feel “lighter.” Acceleration smooths out, the boat holds cruise speed without sagging, and the motor handles rough water better because it isn’t starving for fuel when the tank sloshes. This filter also keeps water and grit out of the expensive parts—injectors, fuel pumps, rails—so the fuel system stays healthy long-term.

Why Buy OEM

OEM filters aren’t just about fit—they use media that holds up to heat, pressure, and vibration. Aftermarket filters might look the same, but they often restrict flow or let fine debris sneak through. When you’re dealing with a fuel system this sensitive, the right filter prevents a lot of unnecessary troubleshooting.

FAQ

Q1: What are the signs this filter needs changing?
A: Sluggish throttle, power loss at cruise, or the engine feeling “tight” under load.

Q2: How often should I replace it?
A: Most boaters do it once a season; sooner if fuel quality is questionable.

Q3: Can I handle the install myself?
A: Yes—basic tools and a rag for drips, and you’re done in minutes.

Q4: Will this help with small amounts of water in the fuel?
A: Yes, that’s part of its job—catching water and fine debris early.

Q5: Why avoid cheaper filters?
A: Poor media, bad seals, and reduced flow. You’ll feel it at the throttle sooner than you think.

• Supersessions
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