Sierra 18-7945 Fuel Water Separator Filter, 10 Micron, Replaces Mercury/MerCruiser 35-802893Q01

The Sierra 18-7945 is a 10 micron fuel water separating filter built to protect gasoline-powered marine engines from water contamination and particulate damage. It removes over 99.8% of emulsified water from gasoline and is over 90% efficient at filtering out particles as small as 10 microns, while still flowing at 90 GPH to keep fuel delivery steady even under heavy demand. This level of filtration is especially important for sensitive inboard, sterndrive, and outboard fuel injection systems, where water or debris in the fuel line can cause misfires, injector damage, or corrosion over time.

The 18-7945 measures 4.35 inches (110.5 millimeters) in length, making it a long/tall-profile filter. It is also used as the filter element inside Sierra's 1/4 inch and 3/8 inch stainless steel filter kits (paired with a mounting bracket and pipe plugs), so it can be sourced individually as a replacement element for those kit installations or purchased on its own for direct-fit replacement service. It is designed for Mercury/MerCruiser and Yamaha fuel systems and is manufactured to meet or exceed the specifications of the original equipment part it replaces.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7945
• Micron Rating: 10 Micron
• Flow Rate: 90 GPH
• Filter Length: 4.35 inches (110.5 millimeters)
• Weight: 1.06 pounds
• Fit Type: Universal Fit
• Compatible Vehicle Type: Mercruiser-powered Boats
• Unit Count: 1

Fitment

Designed for Mercury/MerCruiser and Yamaha gasoline fuel systems, including inboard, sterndrive, and outboard fuel injection applications.

Replaces (OEM)

• Mercury/MerCruiser 35-802893Q01
• Mercury/MerCruiser 35-604941
• Mercury/MerCruiser 35-60494
• Mercury/MerCruiser 35-55501
• Mercury/MerCruiser 35-57250
• Mercury/MerCruiser 35-60494A5
• Mercury/MerCruiser 35-806771
• Mercury/MerCruiser 35-8052691
• Mercury/MerCruiser 35-802893Q
• Mercury/MerCruiser 35-807172
• Yamaha ABB-FUELF-IL-TR

Frequently Asked Questions

What micron rating does the Sierra 18-7945 filter provide? The Sierra 18-7945 is rated at 10 microns, removing over 99.8% of emulsified water from gasoline and filtering out over 90% of particles as small as 10 microns.

Will the 18-7945 keep up with fuel demand on a larger engine? Yes, this filter flows at 90 GPH, which is enough to feed high-demand engines while still providing 10 micron filtration.

What OEM part numbers does the Sierra 18-7945 cross-reference? It replaces Mercury/MerCruiser part numbers 35-802893Q01, 35-604941, 35-60494, 35-55501, 35-57250, 35-60494A5, 35-806771, 35-8052691, 35-802893Q, and 35-807172, as well as Yamaha part number ABB-FUELF-IL-TR.

What engines is the 18-7945 fuel filter designed for? The Sierra 18-7945 is designed for Mercury/MerCruiser and Yamaha gasoline fuel systems, including inboard, sterndrive, and outboard fuel injection applications.

How long is the Sierra 18-7945 filter? It measures 4.35 inches (110.5 millimeters) in length, a long/tall-profile filter element.

How much does the 18-7945 filter weigh? The filter weighs 1.06 pounds.

Is the 18-7945 sold as a complete kit with a mounting bracket? No, part number 18-7945 is the filter element itself. It is also used as the replacement filter inside Sierra's 1/4 inch and 3/8 inch stainless steel filter kits, which include a separate bracket and pipe plugs.

Why is a fuel water separator filter important on a gasoline marine engine? A fuel water separator like the 18-7945 removes water and particulate from gasoline before it reaches the engine, which is important for protecting sensitive inboard, sterndrive, and outboard fuel injection systems from damage.

Does the 18-7945 meet original equipment specifications? Yes, the Sierra 18-7945 is manufactured to meet or exceed the specifications of the original equipment fuel water separator filters it replaces.

How many filters come in a package of the 18-7945? The Sierra 18-7945 is sold as a single filter unit.