Mercury – Water Separating and Sensing Fuel Filter Kit | Fuel Protection Series | Metal & Composite Assembly | 8M0157708

Overview

If you’ve spent enough time on the water, you already know how unpredictable fuel can be. Some days it’s clean and fresh; other days you can almost feel the engine hesitate, like it’s second-guessing what just ran through the lines. That’s why a dependable filtration system matters so much — and why this Mercury Marine part earns a spot in so many boats. The 8M0157708 Water Separating and Sensing Fuel Filter Kit gives you that steady, reassuring feeling that your engine is getting the clean, dry fuel it needs. Whether you’re twenty miles offshore or easing back into the marina after a long run, it’s the kind of part that keeps the day smooth.

Key Features

• Ten micron water separating filter designed to remove water, debris, and contaminants
• Full kit includes mounting head, filter canister, wiring harness, water-in-fuel sensor, and connection hardware
• Powder-coated metal shell for enhanced corrosion resistance
• Wiring harness integrates cleanly with Mercury electrical systems
• Designed to protect both propulsion engines and onboard generators
• Meets USCG and ABYC H-24 fuel system requirements when installed with approved components

Engine & Boat Compatibility

• Built for Mercury L6 Verado outboards that use a remote or boat-mounted fuel filter
• Suitable for other gasoline outboards, sterndrives, and inboard engines requiring a remote filtration setup
• Works well on offshore center consoles, dual consoles, cruisers, pontoons, and multi-engine setups
• Ideal for boats that see long runs, high fuel turnover, or extended time in saltwater conditions

Performance & Practical Benefits

There’s something you notice pretty quickly once this kit is installed: the engine feels steadier. Clean fuel makes a difference you can feel in the throttle — smoother response, a more confident idle, and fewer small hesitations when conditions get rough. The ten micron filter traps the kind of fine grit and water that can quietly wear down injectors and fuel pumps.

And the sensing feature? That’s where this kit really shines. The water-in-fuel sensor acts like an early warning system, letting you know if moisture starts to seep into the fuel supply. Instead of guessing or waiting for the engine to stumble, you get a clear signal before trouble starts.

Installation is straightforward, even if you don’t consider yourself a full-time mechanic. The mounting head, wiring harness, and hardware come together cleanly, and once the canister seats with that tight, secure feel, the system becomes one of those “install it and forget it” upgrades. Salt spray, heat, vibration — this kit is built to handle all of it.

Over months and seasons, keeping water out of the fuel system pays off in real ways: reduced wear, fewer unexpected shutdowns, and a smoother-running engine that responds the same on day 100 as it did on day one.

Why Buy OEM

With something as critical as fuel filtration, OEM isn’t just a preference — it’s a smart choice. Mercury Marine designed this kit with Verado engines in mind, which means every part of it — from the sensor to the flow rate — is matched to the engine’s needs. Aftermarket kits often cut corners on materials, sealing surfaces, or wiring quality, and that’s not where you want to gamble.

OEM gives you reliability you can count on. Fewer surprises, better engine life, and peace of mind every time you push the throttle forward. It’s the kind of upgrade you’d recommend to any friend who runs a Verado or relies on a boat-mounted filter system.

FAQ

Q1: Which engines does the 8M0157708 kit fit?

It’s designed for Mercury L6 Verado outboards and other gasoline engines using a remote fuel filter.

Q2: What makes this kit different from aftermarket alternatives?

It meets OEM specs, includes a reliable water-in-fuel sensor, and provides superior corrosion resistance and filtration accuracy.

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

Match your existing filtration setup or verify that your engine uses a remote-mounted fuel filter system.

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

Absolutely — the powder-coated shell and durable components handle either environment with ease.

Q5: Is installation straightforward for most boat owners?

Yes. With basic tools, most boaters or technicians can install it without difficulty.