Mercury Water Separating Fuel Filter (450R, 500R & V12 Outboards) 8M0166540

The Mercury Water Separating Fuel Filter 8M0166540 is a genuine Mercury OEM fuel filtration system designed to remove water and contaminants before they reach the engine. This complete assembly helps protect high-performance outboards from fuel-related issues that can reduce horsepower, efficiency, and reliability.

Compatible With:

• Mercury Racing 4.6L V8 450R outboards (serial numbers 1E083006-1E099720)
• Mercury Racing 4.6L V8 500R outboards (serial number 1E099432 and newer)
• Mercury V12 500HP Verado outboards (serial number 3B060047 and newer)
• Mercury V12 600HP Verado outboards (serial number 3B060047 and newer)
• Mercury V12 SeaPro outboards (serial number 3B060047 and newer)

This complete water separating fuel filter assembly removes moisture and contaminants from the fuel supply to help maintain engine performance and protect sensitive fuel system components. The integrated water-in-fuel sensor helps monitor fuel quality while supporting reliable engine operation.

Designed for demanding marine environments, this fuel filter assembly meets U.S. Coast Guard and ABYC H-24 fuel system requirements, as well as CFR 183.90 and ISO 10088 fire testing standards.

Kit Includes:

• Water separating fuel filter
• Filter base
• Water-in-fuel sensor
• Fittings
• Plug
• Fuel filter extension harness

Genuine Mercury fuel system components are engineered and tested to Mercury Marine specifications to provide dependable filtration, proper fitment, and long-term reliability.

To confirm compatibility, contact our team with your engine serial number at (727) 596-5929 before ordering.