Mercury – Quicksilver Fuel Pump Cooler Kit | Cooling & Fuel System Components | Durable Marine-Grade Construction | 8M0125846

Overview

Anyone who’s run a big-block or small-block MerCruiser on a hot summer afternoon knows how good it feels when the engine stays steady, cool, and predictable. You can hear it in the tone of the exhaust and feel it in the smooth pull as you throttle up. That confidence doesn’t happen by accident — it comes from parts that keep fuel temperatures under control even when the rest of the world is heating up. The Quicksilver 8M0125846 Fuel Pump Cooler Kit is one of those quiet heroes, helping the engine stay happy so you can focus on the ride instead of worrying about vapor lock or heat-related hiccups.

Key Features

• Helps regulate fuel pump temperature for more consistent engine performance
• Designed for V6 and V8 MerCruiser engines including 305, 350, 377, 454, 502, and all 496 cubic-inch models
• Suitable for both sterndrive and inboard applications
• Marine-grade construction designed to withstand heat and vibration
• Straightforward installation with common tools

Engine & Boat Compatibility

• Fits MerCruiser V6 and V8 sterndrive and inboard engines (305, 350, 377, 454, 502 CID) within serial numbers 0L000000–0M299999
• Compatible with all 496 cubic-inch MerCruiser engines
• Works with Black Scorpion sterndrive models from serial 0L000000 and up
• Common on cruisers, bowriders, wake boats, sport boats, and classic inboard setups
• Ideal for boaters who push their engines hard in warm climates or heavy-load situations

Performance & Practical Benefits

You’ll notice the difference this kit makes the moment you run the boat on a hot day. By keeping the fuel pump cooler, the engine responds more cleanly, without hesitation or the sluggish feeling that comes when fuel temps start creeping up. Throttle transitions feel smoother, idle stays steadier, and there’s a quiet confidence in knowing the engine is getting fuel at the right temperature every time.

Durability matters, and this kit is built for real-world use. It handles heat, water spray, and constant vibration without feeling fragile or wearing out before its time. Because it’s engineered to Mercury Marine specifications, it fits neatly into the system without improvising or modifying anything. Installation is simple enough that many boaters knock it out in an afternoon, and once it’s in place, maintenance stays straightforward season after season.

Why Buy OEM

A cooling component like this isn’t the place to gamble on off-brand alternatives. With a genuine Mercury Marine part, you know the cooling flow, routing, and fitment match the engine exactly as intended. Aftermarket versions can vary in tolerances or materials, which can lead to uneven cooling or premature failure. Sticking with this Mercury Marine part number ensures you’re giving your engine the same quality it was designed around. It’s the practical choice — the one that protects your investment while keeping performance predictable and strong. This is the kind of advice old-school boaters pass down because it holds up year after year.

FAQ

Q1: Which engines does the Quicksilver 8M0125846 Fuel Pump Cooler Kit fit?

It fits MerCruiser V6 and V8 engines including 305, 350, 377, 454, 502, all 496 engines, and Black Scorpion models within the listed serial ranges.

Q2: What makes this different from aftermarket options?

It’s designed to Mercury Marine’s exact specifications, giving you better fitment, long-term durability, and more consistent cooling performance.

Q3: How can I confirm this is the right kit for my setup?

Check your engine’s displacement and serial number. If it falls within the ranges listed, this is the correct Mercury Marine part.

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

Absolutely. This kit is built for harsh marine environments in either type of water.

Q5: Is installation manageable for most boat owners?

Yes. Most people with basic mechanical skills and common tools can install it without trouble.