Sierra Fuel Filter

Sierra 18-7844 Water Separating Fuel Filter for Sterndrives and Outboards

Sierra replacement water separating fuel filter for use with Mercury and MerCruiser engines. Sierra fuel water separators remove over 99.8% of emulsified water from your gasoline. Sierra's 21 micron canister filters feature an epoxy-coated steel canister that prevents corrosion inside the canister from reaching your fuel system. These durable filters are pressure and leak tested to ABYC and USCG standards. All filters flow at 90 GPH to feed even the hungriest motor. Sierra 21 micron filters are recommended to prevent damage to sensitive inboard and outboard fuel injection systems.

Application:

• Used on MerCruiser and Mercury Engines
• 21 Micron Rating
• 3.875" in Length (Short)
• 11/16-16 Thread pitch

Sierra recommends replacing filters every 50 hours of operation, or at a minimum of once per year, preferably at winterization.

Interchangeable with:

• EMP
• 35-37800
• Fram
• PS3808
• GLM
• 24941
• Mallory
• 9-37800
• MerCruiser Stern Drive
• 35-52456
• 35-55501
• 35-57250
• 35-60494
• 35-604941
• 35-60494A5
• 35-802893Q
• 35-802893Q01
• 35-805269
• 35-8052691
• 35-806771
• 35-807172
• Mercury Marine
• 35-604941
• 35-802893Q
• 35-8052691
• 35-807172
• Moeller
• 33323-10
• Valmar
• 52113
• Wix
• 33225

Frequently Asked Questions

What is the Sierra 18-7844 water separating fuel filter used for?

The Sierra 18-7844 is a replacement water separating fuel filter designed for use with Mercury and MerCruiser sterndrive and outboard engines. It helps remove water and contaminants from gasoline before they reach the fuel system.

How effective is the Sierra 18-7844 at removing water and debris?

This filter removes over 99.8% of emulsified water from gasoline. It uses a 21 micron filter media and features an epoxy-coated steel canister to help prevent internal corrosion from reaching the fuel system.

What are the main specifications of the Sierra 18-7844 fuel filter?

The Sierra 18-7844 has a 21 micron rating, measures 3.875" in length, and uses an 11/16-16 thread pitch. It also flows at 90 GPH to support demanding marine fuel systems.

How often should the Sierra 18-7844 fuel filter be replaced?

Sierra recommends replacing this filter every 50 hours of operation or at least once per year, preferably during winterization.

What part numbers is the Sierra 18-7844 interchangeable with?

This filter is interchangeable with a wide range of part numbers including EMP 35-37800, Fram PS3808, GLM 24941, Mallory 9-37800, Moeller 33323-10, Valmar 52113, Wix 33225, and several Mercury and MerCruiser part numbers such as 35-52456, 35-55501, 35-57250, 35-60494, 35-604941, 35-60494A5, 35-802893Q, 35-802893Q01, 35-805269, 35-8052691, 35-806771, and 35-807172.

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