Sierra Fuel/Water Separator Filter AMRS-18-7945 — 10‑Micron Long Element, 90 GPH Flow (Replaces Mercury 35-802893Q01)

The Sierra AMRS-18-7945 is a long 10‑micron fuel/water separator designed to protect marine fuel systems by removing emulsified water and fine particles.

This replacement filter is built for boats and other gasoline engines that require high-efficiency contaminant removal without restricting flow. Engineered to match common OEM cross-references such as Mercury 35-802893Q01, Yamaha ABB-FUELF-IL-TR and others, the Sierra AMRS-18-7945 maintains steady 90 GPH flow while trapping water and particles that can harm modern fuel injection components.

How does this filter protect fuel injection systems?

The AMRS-18-7945 combines a coalescing barrier for emulsified water with 10‑micron particulate filtration to guard sensitive injectors and pumps. By shedding water and capturing debris, it helps reduce clogged injectors and premature wear in fuel-system components without reducing required fuel flow.

• 10‑micron rating targets particles that can damage injectors
• Coalescing media separates emulsified water for easier drainage
• Rated flow at 90 GPH to support high-demand engines
• Long 4.35" element increases service interval capability

What engines and part numbers does this replace?

The AMRS-18-7945 is manufactured to fit a wide range of marine and small gasoline engines that reference similar size and function. It directly replaces several OEM and aftermarket part numbers, making it a straightforward swap for many maintenance scenarios.

• Replaces Mercury 35-802893Q01 and OMC 0509532
• Compatible with Yamaha ABB-FUELF-IL-TR and Tohatsu 3Y9022340
• Cross-references Mallory 9-37801, GLM 24940, Redline RL7844, Fram PS3808
• Appropriate for both inboard and outboard fuel-injected engines

How easy is it to install and maintain?

Installation follows the same basic steps as other spin-on or cartridge fuel/water separators: drain any separated water, remove the old element, and fit the new filter. The long format and standard media mean no special tools are required for most housings, and routine inspection/drainage extends filter life.

• Fits existing housings that accept the 4.35" long element
• Routine visual checks and bowl drainage recommended
• No special adapters needed for listed cross-reference models
• Designed for straightforward field replacement during service

What performance can I expect on the water?

The Sierra fuel/water separator is engineered to keep fuel clean and flowing under normal marine conditions without restricting engine performance. Its combined water separation and fine-particle capture reduces the risk of injector fouling and maintains consistent fuel delivery at manufacturer-recommended flow rates.

• Removes over 99.8% of emulsified water from gasoline
• Over 90% efficiency for particles at the 10‑micron level
• Maintains fuel flow at 90 GPH to feed high-demand motors
• Recommended to help prevent damage to sensitive fuel systems

Who is this for? The Sierra AMRS-18-7945 is intended for boat owners, marine technicians, and service shops maintaining fuel-injected outboard or inboard gasoline engines that require reliable water separation and fine particulate filtration. It's a practical replacement for anyone needing a direct-fit substitute for common OEM part numbers, offering consistent flow and extended element life in a long 4.35" format. Choose this filter when you want a high-efficiency, easy-to-install separator that preserves fuel-system components and performance on demanding marine applications.