Mercury – Fuel Pump Cooler Kit | EFI Fuel System Cooling | 8M0125852

Overview

Fuel heat can sneak up on EFI engines, especially when you’re running hard or sitting in warm conditions. That’s where the Mercury Fuel Pump Cooler Kit 8M0125852 comes into play. This kit is designed to help manage fuel temperature on select MerCruiser EFI sterndrive and inboard engines, keeping fuel delivery more consistent and combustion more efficient. It’s a behind-the-scenes component, but one that can make a real difference in how smoothly an engine runs over time.

Key Features

• Fuel pump and cooler kit designed for select MerCruiser EFI sterndrive and inboard engines
• Includes fuel pump, cooling heat sink, connectors, and wiring harness
• Helps cool fuel before delivery for more efficient combustion
• Designed for specific EFI applications where fuel temperature control is required
• Built to Mercury Marine OEM specifications for proper fit and performance

Engine & Boat Compatibility

• MerCruiser V-6 and V-8 EFI sterndrive and inboard engines made by General Motors
• 305, 350, 377, 454, and 503 CID engines with serial numbers OL000000 through OM299999
• 496 models and Black Scorpion engines with serial numbers OL000000 and above
• For specific factory-equipped applications only — always verify with service documentation

Performance & Practical Benefits

Managing fuel temperature is an important part of EFI performance, and this kit is used in applications where added cooling is needed. By helping keep fuel cooler as it moves through the system, the engine can maintain more consistent fuel delivery and cleaner combustion. That can translate to smoother operation, especially in demanding conditions.

The kit also supports long-term durability. Excessive fuel heat can stress components over time, and this cooler setup helps reduce that load. Everything in the kit is designed to work together—pump, heat sink, wiring, and connectors—so once installed, it operates quietly and reliably in the background.

Why Buy OEM

Fuel system components aren’t the place to experiment. OEM Mercury parts are engineered to meet exact performance, safety, and durability standards for your engine. This kit is produced to original equipment specifications, ensuring proper integration with the EFI system and correct operation under real-world conditions.

Quicksilver, Mercury’s trusted OEM replacement brand, has been supplying marine engines with tested parts and accessories for decades. These components are designed and validated in demanding environments, giving you confidence that everything will work the way it should. Choosing OEM means fewer surprises and better long-term reliability.

FAQ

Q1: What does this fuel pump cooler kit include?
The kit includes the fuel pump, cooling heat sink, connectors, and wiring harness.

Q2: What engines is this kit used on?
It is used on select MerCruiser V-6 and V-8 EFI sterndrive and inboard engines manufactured by General Motors, including several 305 through 503 CID platforms and certain 496 and Black Scorpion models.

Q3: What is the purpose of the fuel pump cooler?
It helps reduce fuel temperature for more efficient delivery and combustion in specific EFI applications.

Q4: Will this fit all MerCruiser EFI engines?
No. This kit is used only on specific engine models and serial number ranges. Always confirm compatibility using your owner’s or service manual.

Q5: Is this an OEM Mercury part?
Yes. This kit is built to Mercury Marine original equipment specifications and supplied under the Quicksilver OEM replacement program.