Kefly Water-Separating Fuel Filter 35-802893Q01 — 25-Micron Replacement for Mercury/Mariner Outboards

The Kefly 35-802893Q01 is a water-separating fuel filter designed to protect Mercury Marine outboards and MerCruiser engines by trapping water and contaminants before they reach the fuel system.

Built with a 25-micron filter element and engineered for marine applications, this replacement fuel filter helps prevent fuel-related performance problems such as rough idling, reduced power, and clogged injectors. It fits a wide range of Mercury Mariner outboards and MerCruiser sterndrives/inboards (with specific exceptions), and is intended as a seasonal or periodic maintenance item to keep your engine running reliably on the water.

How does this filter remove water and protect my engine?

The Kefly 35-802893Q01 separates free water and captures solid contaminants using a media rated to 25 microns. Water droplets settle out while particulate matter is trapped in the filter media, reducing the chance of injector or carburetor blockages and corrosion in the fuel system.

• 25-micron element captures fine particles that harm fuel systems.
• Water-separating design sheds free water before it reaches the engine.
• Reduces risk of stalling, misfires, and degraded performance.

Which Mercury and MerCruiser engines will this part fit?

This replacement filter is compatible with most Mercury Marine outboards and MerCruiser sterndrives and inboard engines. Note the specified exceptions: it does not fit 1992 MerCruiser 4.3L Gen II engines equipped with an in-line fuel filter, nor 1.6L Vazer and 3.0L MPI engines.

• Replacement part number: 35-802893Q01 for easy cross-referencing.
• Fits a broad range of Mercury Mariner outboards and MerCruiser models.
• Check engine model/year against exceptions before purchase.

When should I replace the Kefly water-separating filter?

For normal recreational use, the manufacturer guidance is to replace the filter once per season or every 100 hours of operation, whichever comes first. Replace sooner if you notice fuel-related issues, contamination, or after long storage where water intrusion may have occurred.

• Recommended service interval: one season or 100 operating hours.
• Replace immediately if fuel smells of water or performance drops.
• Keep a spare on board for extended trips or remote maintenance.

What practical benefits will I notice after installing this filter?

Installing the Kefly 35-802893Q01 helps maintain steady engine performance and reduces the likelihood of fuel-system damage caused by moisture and debris. You should see smoother starts, more consistent throttle response, and fewer fuel-related interruptions while boating.

• Improved engine reliability during extended runs.
• Fewer clogs to fuel lines, pumps, and injectors.
• Lower long-term repair risk for fuel-system components.

Who is this for: The Kefly 35-802893Q01 is aimed at boat owners, marine mechanics, and fleet operators who use Mercury Mariner outboards or MerCruiser sterndrives/inboards and want a reliable, OEM-style fuel filter that removes water and fine contaminants. If you perform routine engine maintenance, operate in wet or variable fuel-quality environments, or need a drop-in replacement part (35-802893Q01), this filter is a practical choice to protect your fuel system and maintain performance.