Sierra Fuel Water Separator Filter - SIE-18-7945

Sierra 18-7945 10 Micron Fuel Water Separator Filter

The Sierra 18-7945 is a 10-micron fuel water separator filter that removes 99.8% of emulsified water from gasoline while maintaining 90 GPH flow rate. This long filter measures 4.35 inches with 11/16-16 thread pitch and works with Honda, MerCruiser, Mercury Marine, and Yamaha engines. It's particularly effective for boats running ethanol-blended fuels, which absorb more water and loosen more particulates than regular gasoline. The filter meets ISO, SAE, and JIS standards and serves as a direct OEM replacement. Replace every 50 hours or annually during winterization for optimal engine protection.

Features:

Ethanol blended fuel absorbs more water and loosens more particulates than regular fuels

Proper filtration is required for every horsepower engine

The Sierra 18 7945 Fuel Water Separator Filter is over 90% efficient at removing particles as small as 10 micron

All filters flow at 90 GPH for reach motors faster

Specifications:

Rating: 10 Micron

Filter Size: Long - 4.35" or 110.5mm

Thread Pitch: 11/16-16

Sierra recommends replacing your filters every 50 hours of operation or at a minimum of once per year, preferably at winterization. 10-Micron filters are your number one defense against problems caused by ethanol fuels. It is important that you do not over-tighten filters, and always inspect for leaks after installation.

Interchangeable with:

Honda Outboard

17670-ZX2-000HE

MerCruiser Stern Drive

35-807172

35-604941

35-60494

35-55501

35-57250

35-60494A5

35-806771

35-8052691

35-802893Q01

35-802893Q

35-802893T

Mercury Marine

35-604941

35-8052691

35-807172

35-802893Q01

35-52456

35-802893T

Yamaha Outboard

ABB-FUELF-IL-TR

MAR-SPRTR-HD-SS

Frequently Asked Questions

• What is the Sierra 18-7945 10 Micron Fuel Water Separator Filter used for? The Sierra 18-7945 is a 10-micron fuel water separator filter designed to remove emulsified water and particulates from gasoline. It maintains a 90 GPH flow rate and is particularly suited for boats using ethanol-blended fuels, which can absorb more water and loosen more particulates than regular gasoline.
• What are the specifications of the Sierra 18-7945 fuel water separator filter? The Sierra 18-7945 has a 10-micron rating, a long filter size measuring 4.35 inches (110.5 mm), and an 11/16-16 thread pitch. The filter flows at 90 GPH and is over 90% efficient at removing particles as small as 10 microns.
• How often should the Sierra 18-7945 filter be replaced? Sierra recommends replacing the 18-7945 filter every 50 hours of operation or at least once per year. The product description recommends replacing it preferably during winterization as part of maintaining proper fuel filtration and engine protection.
• Can the Sierra 18-7945 be used with ethanol-blended fuel? Yes. The Sierra 18-7945 is particularly effective for boats running ethanol-blended fuels. The product description notes that ethanol-blended fuel absorbs more water and loosens more particulates than regular fuels, making proper fuel filtration important for marine engines.
• Which engines and replacement part numbers are compatible with the Sierra 18-7945? The Sierra 18-7945 works with Honda, MerCruiser, Mercury Marine, and Yamaha engines. Listed interchangeable numbers include Honda 17670-ZX2-000HE, MerCruiser 35-807172 and 35-604941, Mercury Marine 35-604941 and 35-807172, and Yamaha ABB-FUELF-IL-TR and MAR-SPRTR-HD-SS. Verify your existing filter number before installation.
• What should I check when installing the Sierra 18-7945 fuel filter? Do not over-tighten the Sierra 18-7945 filter during installation. After installation, always inspect the filter and connections for leaks. Following the manufacturer's replacement and installation recommendations helps ensure the fuel water separator is properly installed and maintained.