Mercury Marine Outboard Fuel Filter — Quicksilver 35-879885Q / 35-879885T

Keep your Mercury Marine outboard engine running clean and strong with this high-performance gas/water separator fuel filter. Engineered as a direct replacement for Quicksilver part numbers 35-879885Q and 35-879885T, this filter is compatible with Mercury Marine outboard engines ranging from 30 to 400 HP. Made in China.

Why This Fuel Filter?

Exact OEM-Compatible Fitment: Designed to match Quicksilver part numbers 35-879885Q and 35-879885T for a precise, leak-free fit — no modifications required.
Superior Filtration: Effectively traps water, sediment, and fuel contaminants before they reach sensitive engine components, reducing wear and protecting your investment.
Premium Construction: Built from high-grade, resilient materials to withstand the harsh marine environment, including exposure to salt water, vibration, and temperature extremes.
Easy Installation: Features universal-fit 8mm / 5/16" hose barbs for quick, tool-minimal installation or replacement — ideal for DIY boat maintenance.
Protects Engine Longevity: Consistent delivery of clean fuel prevents fuel system blockages, extending the life of your outboard engine and keeping it performing at peak efficiency.

Specifications

Compatible Part Numbers: 35-879885Q, 35-879885T
Compatible Engine Range: 30–400 HP Mercury Marine / Quicksilver Outboard Engines
Hose Barb Size: 8mm / 5/16"
Type: Gas/Water Separator Fuel Filter
Available In: 1-pack or 3-pack options
Country of Origin: Made in China

Package Contents

Fuel Filter × 1 (or × 3 depending on selected quantity)

Marine Engine Maintenance Tips

Regular fuel filter replacement is one of the most important — and most overlooked — aspects of outboard engine maintenance. The U.S. Environmental Protection Agency (EPA) recommends routine engine maintenance to reduce marine emissions and ensure optimal performance. Replacing your fuel filter seasonally or every 100 hours of operation helps prevent costly repairs and keeps your boat running safely on the water.

Learn more: Kawasaki Motors

Frequently Asked Questions

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

A: This fuel filter is designed to replace Quicksilver part numbers 35-879885Q and 35-879885T, and is compatible with Mercury Marine outboard engines from 30 HP to 400 HP. Always verify your engine's part number before ordering to ensure the correct fit.

Q: What size are the hose barbs on this fuel filter?

A: The hose barbs on this filter measure 8mm (5/16"), providing a standard, secure connection to compatible Mercury Marine outboard fuel systems.

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

A: For most Mercury Marine outboard engines, it is recommended to replace the fuel filter at least once per boating season or every 100 hours of operation — whichever comes first. Regular replacement helps prevent fuel flow restrictions, engine hesitation, and costly damage to the fuel system.

Q: Is this a gas/water separator filter?

A: Yes. This filter functions as both a fuel filter and a water separator, trapping not only particulate contaminants but also water that may have entered the fuel system — a common concern in marine environments.

Q: Can I install this fuel filter myself?

A: Absolutely. The universal-fit 8mm / 5/16" hose barbs make this filter straightforward to install with minimal tools. Always ensure the engine is off and fuel lines are depressurized before beginning any fuel system maintenance.