Mercury MerCruiser Fuel Cooler Kit - 8M0125846
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Mercury MerCruiser / Quicksilver Fuel Cooler Kit – 8M0125846
Maintain proper fuel temperature and reliable engine performance with the genuine Mercury Marine / Quicksilver 8M0125846 Fuel Pump & Cooler Kit. This OEM Cool Fuel system replacement kit helps keep fuel temperatures stable while supplying consistent fuel pressure to the engine’s fuel injection system.
Designed to Mercury Marine’s original equipment specifications, the kit replaces the Cool Fuel pump and cooler assembly used on many MerCruiser sterndrive and inboard engines, improving reliability and preventing vapor lock in high-performance marine environments.
Key Features
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Genuine Mercury / Quicksilver OEM fuel pump & cooler kit
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Helps regulate fuel temperature and pressure in EFI fuel systems
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Designed for Cool Fuel Gen II fuel modules
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Protects fuel injectors, pumps, and engine performance
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Durable components designed for harsh marine environments
Kit Includes
Typical kit components include:
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Electric fuel pump
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Fuel cooler assembly
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Multiple O-rings and seals
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Fuel pressure regulator filter
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Mounting hardware and fittings
Replaces / Supersedes
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861156A02
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861156A01
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Sierra 18-8861 aftermarket equivalent
Compatible Mercury MerCruiser Engines
Commonly used on MerCruiser sterndrive and inboard engines with Cool Fuel systems, including:
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305 CID (5.0L) V8
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350 CID (5.7L) V8
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377 CID (6.2L) V8
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454 CID (7.4L) V8
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502 CID (8.2L) V8
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496 CID engines
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Black Scorpion models
Typically used on engines within serial ranges 0L000000 – 0M299999 depending on configuration.
Important Compatibility Note
This kit is designed specifically for MerCruiser engines equipped with the Cool Fuel system. Always confirm compatibility using the engine serial number to ensure the correct replacement part.
OEM parts ship same or next day for fast Canada wide shipping.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.