8M0125853 Mercury MerCruiser Fuel Cooler | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Fuel Cooler - Part Number: 8M0125853

A genuine Quicksilver fuel cooler for MerCruiser MPI petrol engines. This cooler is used in the Cool Fuel / fuel supply system on selected MerCruiser 4.3L, 5.0L, 5.7L and 6.2L MCM and MIE MPI engines where the fuel cooler diagram specifies 8M0125853.

⚙️ Key Features

• Genuine Quicksilver OEM fuel cooler

• Correct Mercury part number 8M0125853

• Used in MerCruiser MPI fuel cooling systems

• Fits selected MCM / MIE 4.3L, 5.0L, 5.7L and 6.2L engines where specified

• Related service kit reference: 8M0125847

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 8M0125853 current OEM fuel cooler reference

OEM / Related Numbers:

• 8M0125853

• Mercury 8M0125853

• Quicksilver 8M0125853

• Fuel cooler

• Cool Fuel cooler

• 8M0125847 related fuel cooler kit

• 861267A1 earlier related fuel cooler kit reference

• 25-8M0204683 related fuel cooler O-ring

• 26-8M0214975 related quad ring seal

• 25-805062 related O-ring

• 25-805531 related O-ring

• 861155A3 related fuel boost pump

• 861126A1 related regulator kit

Aftermarket / Verified Equivalents:

• Aftermarket fuel cooler replacements are available where matched to 8M0125853 and the exact MerCruiser fuel-system diagram

🚤 Compatibility

Commonly used on:

• MerCruiser Cool Fuel assemblies

• MerCruiser MPI sterndrive and inboard fuel cooling systems

• MCM / MIE 4.3L, 5.0L, 5.7L and 6.2L MPI fuel systems where 8M0125853 is specified

Typically suits:

• Engine models:

• MerCruiser 4.3L MPI Alpha / Bravo - serial 0M300000 and up where 8M0125853 is specified

• MerCruiser 5.0L MPI Alpha / Bravo - serial 0M300000 and up where specified

• MerCruiser 5.7L MPI Alpha / Bravo - serial 0M300000 and up where specified

• MerCruiser 350 MAG MPI Alpha / Bravo - serial 0M300000 and up where specified

• MerCruiser 350 MAG MPI Horizon Alpha / Bravo - serial 0M300000 and up where specified

• MerCruiser MX 6.2L MPI Bravo - serial 0M300000 and up where specified

• MerCruiser MX 6.2L MPI Horizon Bravo - serial 0M300000 and up where specified

• MerCruiser 5.7L MPI MIE - serial 0M317000 and up where specified

• MerCruiser 5.7L MPI Horizon MIE - serial 0M317000 and up where specified

• MerCruiser 6.2L MPI MIE - serial 0M317000 and up where specified

• MerCruiser 6.2L MPI Horizon MIE - serial 0M317000 and up where specified

• MerCruiser Black Scorpion 350 MPI applications where fuel cooler 8M0125853 is specified

• MerCruiser Scorpion 350 / 377 applications where fuel cooler 8M0125853 is specified

• Engine Type: MerCruiser MPI petrol sterndrive and inboard

• Engine Range: commonly 4.3L, 5.0L, 5.7L and 6.2L where specified

• System Type: Fuel cooler / Cool Fuel component

🔌 Function

The fuel cooler removes heat from the fuel supply before it reaches the injection system. This helps stabilise fuel pressure, reduce vapor formation and support consistent MPI engine operation.

Common signs of failure:

• Fuel leakage around cooler body

• Engine hard starting hot

• Fuel pressure fluctuation

• Corrosion inside or around cooler

• Contaminated fuel or water around fuel module

• Replacement required during Cool Fuel service

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging