Attwood Fuel/Water Separator

The Attwood Fuel/Water Separator (MPN 11841-4) is a critical engine protection component designed for marine and fuel system applications where water contamination poses a serious threat to engine performance and longevity. Whether you're operating in high-humidity environments, dealing with aged fuel storage, or running equipment in challenging field conditions, this separator prevents water from reaching your fuel injectors and combustion chambers—a problem that can cause rough running, stalling, and costly engine damage. Built for reliability in tactical, maritime, and industrial settings, this device keeps your power plant running at peak efficiency when failures aren't an option.

This separator employs a 10-micron filtering capability paired with a double-seal design that enhances both performance and durability under demanding conditions. The dual-seal architecture prevents fuel leakage while ensuring consistent water separation even when subjected to vibration, temperature fluctuations, and pressure cycling typical in mobile or stationary equipment. The compact 5 x 5 x 6-inch footprint and lightweight 3.7-pound construction make it easy to integrate into existing fuel systems without requiring major modifications or adding significant weight to your platform. The 10-micron filter rating effectively captures free water and particulate contaminants before they enter your fuel lines, protecting fuel pumps, injectors, and carburetors from deposits and corrosion.

This separator is ideal for Mercury outboard engines and compatible marine systems, making it an essential upgrade for boat operators, military water operations personnel, and equipment managers tasked with fuel system maintenance. Installation is straightforward, requiring basic plumbing connections to your existing fuel line—no specialized tools or extensive downtime needed. Regular inspection and cartridge replacement ensure sustained protection against the cumulative effects of water ingress, condensation, and fuel degradation, extending engine service life and reducing unplanned maintenance costs in critical operational scenarios.