Mercury – Low Pressure Electric Fuel Pump | Gen III Cool Fuel | Marine Engine Component | 866170T01

Overview

Anyone who’s spent long days on the water knows the engine only runs as well as the fuel system feeding it. When the fuel flow is steady, the boat feels alive — crisp throttle response, smooth idle, effortless acceleration. Mercury Marine part number 866170T01 delivers that kind of confidence. This low-pressure electric fuel pump supports your engine the same way a good deckhand supports the captain: quietly, reliably, and without drawing attention to itself. Whether you’re running offshore swells or cruising calm inland water, having dependable fuel delivery means the entire boat just feels right.

Key Features

• Provides consistent low-pressure fuel delivery.
• Designed for V8 MerCruiser engines with Gen III Cool Fuel modules.
• Built from durable marine-grade components.
• Includes pump and connecting accessories.
• Engineered for clean, efficient fuel flow under all conditions.

Engine & Boat Compatibility

• Fits 305, 350, 377, 496, and 502 cid V8 MerCruiser engines.
• Designed for Gen III Cool Fuel equipped sterndrive engines.
• Suitable for performance boats, cruisers, and tow-sport vessels.
• Compatible with both saltwater and freshwater applications.

Performance & Practical Benefits

A fuel pump like this doesn’t just move fuel — it shapes how the entire boat feels. With steady low-pressure flow, the engine breathes easier. Starts are quicker, idle becomes smoother, and hesitation under acceleration disappears. You’ll feel it immediately in tight maneuvering and especially when you roll into the throttle to get the boat on plane.

This OEM pump is built to handle the heat, vibration, and constant demand of marine use. The internal components resist wear, and its electrical connections are designed for stability in high-moisture environments. Because it’s engineered specifically for Gen III Cool Fuel setups, the installation aligns perfectly — no awkward fittings, no guesswork.

Replacing an aging pump often brings an engine back to life. If you’ve noticed sluggish acceleration, rough idle, or hard starting, this pump can restore the clean, reliable flow your engine was designed around.

Why Buy OEM

Fuel delivery is too important to entrust to generic parts. With an OEM pump, you know the pressure output, electrical characteristics, and fitment match what Mercury intended — and that precision helps protect injectors, fuel rails, and the Cool Fuel module itself. If a fellow boater asked whether aftermarket was worth the risk, I’d say no every time. This is one of those parts where OEM simply delivers the peace of mind you want when family and friends are aboard.

FAQ

Q1: Which engines does this pump fit?

It fits V8 MerCruiser engines with Gen III Cool Fuel modules: 305, 350, 377, 496, and 502 cid.

Q2: What makes OEM better for fuel pumps?

Exact output pressure, correct electrical connections, and long-term durability.

Q3: How do I confirm it’s right for my boat?

Verify engine model and confirm you have a Gen III Cool Fuel module.

Q4: Works in saltwater too?

Yes — it’s built for full marine exposure.

Q5: Easy for most boaters to install?

Yes, though having access to the fuel module is necessary.