Mercury – Quickleen Engine and Fuel System Cleaner | Fuel Care System | Liquid Cleaner Formula | 8M0047931

Overview

You can usually feel it before you can explain it. The engine doesn’t sound quite as smooth. Throttle response feels a little lazy. Maybe there’s a hint of knocking when you lean into it, or the idle just isn’t as steady as it used to be. That’s the stuff that can steal confidence on the water, especially when you’re far from the ramp and you just want your motor to run clean and strong.

Mercury Quickleen is the kind of Mercury Marine part I reach for when I want things to feel right again. It’s not about hype—it’s about restoring that smooth, consistent performance you remember. Add it to the tank, run your normal day, and let it go to work where you can’t easily reach.

Key Features

• Engine and fuel system cleaner designed to remove carbon deposits from internal components
• Helps clean carburetors, fuel injectors, intake valves, spark plugs, piston crowns, and cylinder heads
• Helps prevent engine knocking and piston seize-up tied to heavy carbon build-up
• Can help extend spark plug life by reducing deposit-related fouling
• Safe for use in two-stroke and four-stroke gasoline engines, including carbureted and fuel-injected systems
• Safe for catalyzed engines
• Dosage: 1 ounce treats 5 gallons of fuel
• Bottle size: 12 fluid ounces
• Does not contain fuel stabilizers (pair with a stabilizer when storing fuel)
• Mercury Marine part number 8M0047931

Engine & Boat Compatibility

• Compatible with Mercury gasoline outboards and many other gasoline marine engines
• Works with carbureted and fuel-injected fuel systems
• Suitable for boats like bass boats, pontoons, bay boats, skiffs, and cruisers
• Helpful for engines used seasonally or engines that see lots of idle time and short trips

Performance & Practical Benefits

Quickleen is all about the feel of a clean-running engine. Carbon build-up happens slowly, so the performance drop can be sneaky. You might not notice it day to day, but over a season it can add up—rougher idle, less crisp acceleration, and that uneasy sense that the engine is working harder than it should.

Used occasionally through the season, Quickleen helps break down and remove those carbon deposits from the places that matter most. You don’t “see” it working, but you’ll often notice the engine running smoother and sounding more even. Throttle response feels sharper. Idle feels steadier. And when you push the boat onto plane, it feels more confident—like it’s not hesitating on the way up.

It’s also easy to use. Measure the right amount, add it to the fuel, and keep boating. No disassembly, no special tools, no extra mess. That simplicity makes it a realistic habit, not another chore.

Why Buy OEM

There are plenty of cleaners out there, but OEM matters when you’re putting something into your fuel system. A genuine Mercury Marine part is built to meet manufacturer specifications, which means you’re using a formula designed with real engine components in mind. It’s a practical, long-term play: keep carbon in check now, and you’re less likely to deal with bigger issues later.

If you’re the kind of boater who values reliability more than shortcuts, this is the sort of product that fits your mindset. Clean fuel delivery, cleaner internals, and a smoother-running day on the water.

FAQ Section

Q1: Which Mercury engines or systems does the Quickleen Engine and Fuel System Cleaner fit?

It’s safe for two-stroke and four-stroke gasoline engines, including carbureted and fuel-injected Mercury outboards and many other gasoline marine engines.

Q2: What makes this part different from aftermarket alternatives?

It’s a Mercury Marine part produced to OEM specifications and designed specifically for cleaning carbon-related deposits that affect performance.

Q3: How do I know if this is the correct replacement for my setup?

If you want a cleaner that targets carbon build-up in a gasoline engine fuel system, this is a good match. Confirm by part number 8M0047931.

Q4: Can this be used in both saltwater and freshwater applications?

Yes. It treats fuel and internal engine components, so it’s useful in either environment.

Q5: Is installation straightforward for most boat owners?

Very. Measure the dosage and pour it into the fuel tank. One ounce treats five gallons, so it’s simple to stay consistent.