Mercury Outboard Water Separating Fuel Filter Kit 18458Q4
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Mercury MerCruiser / Quicksilver Fuel Filter – 18458Q4
Protect your engine from fuel contamination with the genuine Mercury Marine / Quicksilver 18458Q4 Water-Separating Fuel Filter Kit. This OEM filter removes water and debris from gasoline before it reaches the fuel system, helping maintain proper engine performance and protecting injectors and fuel components from damage.
Designed to Mercury Marine's original equipment specifications, the filter includes the canister element, O-ring, and blue screw-in water-warning sensor used on many Mercury outboard engines.
Key Features
Genuine Mercury / Quicksilver OEM fuel-water separating filter
10-micron filtration removes water and harmful contaminants
Includes blue water-warning sensor and sealing O-ring
Durable corrosion-resistant canister construction
Designed for quick replacement during routine maintenance
Compatible Mercury Engines
Commonly used on Mercury and Mariner V-6 EFI / DFI outboard engines (1996 and newer) where the filter is located under the engine cowl.
Examples include many:
150 HP V-6 EFI outboards
175 HP V-6 EFI outboards
200 HP V-6 EFI / DFI outboards
225 HP V-6 EFI / DFI outboards
250 HP V-6 EFI / DFI outboards
Exact compatibility depends on engine model and serial number range.
Service Recommendation
Mercury recommends replacing the fuel filter every 100 hours of operation or at least once per boating season to maintain proper fuel system performance and prevent contamination.
Important Compatibility Note
Fuel filters may vary by engine model, fuel system configuration, and serial number range. Always verify compatibility using the engine serial number before ordering the replacement filter.
Shipping: Ships 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.