Mercury - Fuel Rail Assy - 8M0185155. The Mercury Fuel Rail Assy - 8M0185155 is a genuine OEM replacement component designed to deliver precise and consistent fuel delivery across all engine cylinders. Built to Mercury's exact engineering standards, this fuel rail ensures optimal engine performance and longevity in harsh marine environments.. Key Features. OEM-Certified Fit and Performance - Manufactured to Mercury's strict tolerances for seamless integration. Efficient Fuel Distribution - Maint