Generic Spin-On Fuel Filter & Water Separator for MerCruiser 2.5–8.2L — 28‑Micron, 3-3/4" Compact

This spin-on fuel filter and water separator is a direct-fit replacement that removes water and contaminants from fuel for a wide range of MerCruiser and Mercury outboard engines.

Designed as a straightforward service part, this Generic spin-on unit matches OEM form and function for most Mercury, Mariner and Force outboards with an externally mounted water-separating base, and for nearly all MerCruiser installations except 4.3L Gen II engines with an in-line filter. It combines 28-micron filtration with a compact 3-3/4" height to trap dirt while separating free water, helping maintain reliable engine performance between routine services.

What engines and models will this filter fit?

This filter is made to fit externally mounted water-separating bases used across many Mercury, Mariner and Force outboards, plus the majority of MerCruiser sterndrive applications. Verify your engine uses an external spin-on style base; if your 4.3L is a Generation II with an in-line filter, this unit will not fit.

• Compatible with MerCruiser 2.5L, 3.0L, 4.3L*, 5.0L, 5.7L, 6.2L, 7.4L, 8.1L, 8.2L applications
• Fits Mercury, Mariner and Force outboards that have externally mounted water-separating bases
• Not suitable for 4.3L Generation II engines equipped with in-line filters
• Replaces OEM part numbers such as 35-802893Q01, 35-807172 and similar references

How does this filter separate water and protect the engine?

The element uses a pleated media rated at 28 microns to capture particulate contamination while the base and element geometry let water settle away from fuel. Free water collects and drains instead of entering the fuel rail or carburetor, reducing corrosion and injector fouling risk when maintained properly.

• 28-micron filtration catches common debris and rust particles
• Water separation design allows free water to collect and be drained at servicing
• Spin-on seal and construction meet OEM fit and sealing specifications
• Compact 3-3/4" height for compatibility with standard spin-on bases

What are the key specifications and replacement details?

This Generic unit is sized and specified to meet OEM expectations for form, fit and filtration. It replaces multiple factory part numbers, so it’s a convenient service item to keep on board or in your workshop for scheduled maintenance.

• Filtration rating: 28 microns
• Height: 3-3/4 inches (spin-on style)
• Replaces: 35-802893Q01, 35-807172, 35-806771, 35-8052691, 35-904941, 35-60494A5, 35-802893T
• Manufactured to meet OEM specifications for fit and sealing

How should I install and maintain this replacement filter?

Installation is the same as other spin-on filters: drain the system if needed, hand-tighten the new element until the gasket seats, then follow the manufacturer’s recommended torque or rotation count. Regular inspection and timely replacement according to your engine service schedule will keep the fuel system functioning as intended.

• Inspect filter base and O-ring for damage before fitting
• Lubricate gasket lightly with clean fuel or oil, hand-tighten to seat
• Drain collected water during routine checks and after heavy condensation events
• Replace at regular service intervals or when contamination is visible

Who is this for: This Generic spin-on fuel filter/water separator is aimed at boat owners, mechanics and fleet operators who need a reliable, OEM-compatible replacement for most MerCruiser and Mercury outboard fuel systems that use an externally mounted water-separating spin-on base. It’s a practical choice for routine maintenance, winterizing, or to carry as a spare while boating.