Mercury Marine Outboard Gas/Water Separator Fuel Filter — Replaces 35-879885Q & 35-879885T

Keep your Mercury Marine outboard engine running at peak performance with this precision-engineered replacement fuel filter. Compatible with Quicksilver part numbers 35-879885Q and 35-879885T, this 8mm (5/16") gas/water separator fuel filter is built to protect engines ranging from 30 to 400 HP from harmful fuel contaminants, water intrusion, and debris — all at an unbeatable value.

Made in Mainland China.

Why Your Engine Needs a Quality Fuel Filter

Dirty or water-contaminated fuel is one of the leading causes of outboard engine damage. A properly functioning fuel filter removes impurities before they can reach your carburetor or fuel injectors, preventing costly repairs and keeping you on the water. Learn more about marine engine maintenance best practices from the U.S. Consumer Product Safety Commission's Boating Safety Guide.

Key Features

Exact OEM Fitment: Directly replaces Mercury Marine / Quicksilver part numbers 35-879885Q and 35-879885T for a precise, leak-free fit.
Superior Filtration: Engineered to separate water and trap fuel contaminants, protecting delicate engine components from wear and extending engine life.
8mm (5/16") Hose Barbs: Universal-fit hose barb connections ensure easy integration with compatible fuel line systems.
Premium Construction: Built from high-grade, resilient materials designed to withstand the demanding marine environment.
Quick & Easy Installation: Straightforward drop-in replacement requiring minimal tools — ideal for routine maintenance and DIY servicing.
Engine Longevity: Consistent clean fuel delivery prevents fuel system blockages, reduces wear, and maximizes the lifespan of your outboard engine.
Wide Compatibility: Fits Mercury Marine outboard engines rated 30–400 HP.

Product Specifications

Replaces Part Numbers	35-879885Q, 35-879885T
Hose Barb Size	8mm / 5/16"
Compatible HP Range	30–400 HP
Type	Gas/Water Separator Fuel Filter
Country of Origin	Mainland China

Package Contents

Fuel Filter x 1 (single-pack listing; multi-pack options available)

Frequently Asked Questions

Q: What Mercury Marine outboard engines is this fuel filter compatible with?

A: This fuel filter is compatible with Mercury Marine outboard engines ranging from 30 to 400 HP that use Quicksilver part numbers 35-879885Q or 35-879885T. It features 8mm (5/16") hose barb fittings to match the OEM fuel line specifications on these engines.

Q: How often should I replace my Mercury Marine outboard fuel filter?

A: For most Mercury Marine outboard engines, it is recommended to replace the fuel filter at least once per season or every 100 hours of operation — whichever comes first. If you notice reduced engine performance, rough idling, or hard starting, inspect the fuel filter sooner as a clogged or water-saturated filter may be the cause.

Q: Is this an OEM Mercury Marine part or an aftermarket replacement?

A: This is a high-quality aftermarket replacement fuel filter designed to meet or exceed OEM fit and function specifications. It is engineered to directly replace Quicksilver part numbers 35-879885Q and 35-879885T, offering a cost-effective alternative to the original Mercury Marine part.

Q: Do I need special tools to install this fuel filter?

A: No special tools are required. The universal-fit 8mm (5/16") hose barb connections allow for quick and straightforward installation. Simply disconnect the existing fuel lines, remove the old filter, slide the new filter onto the hose barbs, and secure with the original clamps. Always consult your engine's service manual and ensure the engine is off and fuel lines are depressurized before performing any fuel system work.