Sierra 18-7944 Fuel Water Separator Filter, 10 Micron, Replaces Mercury Marine 35-807172

The Sierra 18-7944 is a 10 micron fuel water separator filter built to protect fuel-injected marine engines from the water and particulate contamination common in ethanol-blended fuel. Ethanol-blended fuel absorbs more water and loosens more particulate than regular fuel, so proper filtration is required for every horsepower engine. This filter rates over 90% efficient at removing particles as small as 10 micron and flows at 90 GPH to keep up with high-demand engines. It is built with a metal outer housing for durability in the marine environment. The 18-7944 is the short-filter version in Sierra's fuel water separator lineup and is used as the filter element in Sierra's 1/4 inch aluminum fuel water separator kits (part numbers 18-7983-1 and 18-7983-2), each of which pairs it with an 18-7853-1 mounting bracket and 1/4 inch pipe plugs. For engines built around a taller filter housing, Sierra offers the related 18-7945 filter instead, so confirm which filter your existing bracket and housing were built for before ordering. The 18-7944 is a universal-fit filter intended as a direct equivalent to the OEM Mercury Marine filter it replaces.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7944
• Micron Rating: 10 Micron
• Flow Rate: 90 GPH
• Filtration Efficiency: Over 90 percent efficient at removing particles as small as 10 micron
• Material: Metal
• Weight: 1 pound
• Fit Type: Universal Fit
• Vehicle Service Type: Watercraft
• OEM Equivalent Part Number: Mercury Marine 35-807172

Fitment

Universal fit for watercraft fuel systems using this filter size; not restricted to a specific make, horsepower, or model in the source data.

Replaces (OEM)

• Mercury Marine 35-807172

Frequently Asked Questions

What does the Sierra 18-7944 fuel water separator filter do? It removes water and particulate contamination from marine fuel before it reaches the engine, which is important with ethanol-blended fuel because that fuel absorbs more water and loosens more particulate than regular fuel.

What micron rating is the 18-7944 filter? The 18-7944 is rated at 10 microns and is over 90 percent efficient at removing particles as small as 10 micron.

What is the OEM equivalent for the 18-7944? The Sierra 18-7944 is the equivalent to Mercury Marine part number 35-807172.

How much fuel flow can the 18-7944 handle? The 18-7944 flows at 90 GPH, which is rated to feed even high-demand engines.

How much does the 18-7944 filter weigh? The Sierra 18-7944 fuel water separator filter weighs 1 pound.

What is the housing made of on the 18-7944? The 18-7944 has a metal outer housing.

Does the 18-7944 fit a specific engine make or horsepower? The 18-7944 is listed as a universal fit filter for watercraft fuel systems rather than being tied to one specific engine make, horsepower, or model.

What is the difference between the 18-7944 and the 18-7945 filter? The 18-7944 is the short-filter version used in Sierra's short-filter fuel water separator kits, while the 18-7945 is the tall-filter version used in Sierra's tall-filter kits; they are not interchangeable in a housing built for the other size.

What comes in the box with the 18-7944? The 18-7944 ships as a single fuel water separator filter unit; it does not include the mounting bracket or pipe plugs that come bundled in Sierra's complete filter kits like the 18-7983-1.

Is the Sierra 18-7944 a genuine part or aftermarket? The 18-7944 is manufactured and sold under the Sierra brand as a direct equivalent to the Mercury Marine 35-807172 filter, not a Mercury Marine branded part.

How often should the 18-7944 filter be replaced? Proper filtration with a filter like the 18-7944 is required for every horsepower engine, and it should be replaced as part of routine fuel system maintenance since it is a consumable filtration component.

Can the 18-7944 be used in Sierra's fuel water separator kits? Yes, the 18-7944 is the filter element used in Sierra's 1/4 inch aluminum short-filter kits, part numbers 18-7983-1 and 18-7983-2, alongside the 18-7853-1 bracket and 1/4 inch pipe plugs.