Sierra 18-7982 Fuel Water Separator Kit, 1/4 Inch Aluminum, 10 Micron - Available in Standard Kit or Filter with Bonus Pack

The Sierra 18-7982 fuel water separator kit protects gasoline fuel-injected marine engines from water contamination and particulate damage. Built around a 1/4 inch (6.4mm) aluminum tall-filter housing, the kit uses a 10 micron filter element that is over 90% efficient at removing particles as small as 10 microns, while removing over 99.8% of emulsified water from the fuel before it reaches the engine. Rated to flow up to 90 gallons per hour, the filter is sized to keep pace with high-demand fuel-injected motors without restricting flow. It is designed for use on inboard, sterndrive, and outboard fuel-injection systems and is cross-referenced to multiple Mercury Marine fuel-water separator part numbers, making it a straightforward replacement where those numbers are specified.

The line is offered in two configurations. The standard kit (18-7982-1) includes one 10 micron aluminum filter element (18-7945) and a mounting base (18-7853-1), giving you everything needed for a complete first-time installation or full kit replacement. The filter with bonus pack (18-7982-2) adds a second, spare filter element on top of the same core kit, so you have a ready replacement element on hand for the next service interval without ordering separately.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7982
• Filter Micron Rating: 10 Micron
• Filter Size: 1/4 inch (6.4mm)
• Material: Aluminum
• Filter Style: Tall Filter
• Fuel Flow Rate: 90 gallons per hour
• Water Removal Efficiency: Removes over 99.8% of emulsified water from gasoline
• Particle Filtration Efficiency: Over 90% efficient at removing particles as small as 10 microns
• Vehicle Service Type: Boat
• Fit Type: Universal fit for gasoline fuel-injected engines
• OEM Cross Reference: Mercury 35-802893A4, 35-60494A4, 35-807172A4, 35-60494A1, 35-57250A1, 35-55501A1, 35-52456A1
• Weight: 0.36 pounds (Standard Kit); 1.08 pounds (Filter with Bonus Pack)
• Kit Contents: 1 x 18-7945 filter element and 1 x 18-7853-1 mounting base (Standard Kit); adds a second spare filter element (Filter with Bonus Pack)

Sizes & Options

Both options share the same 1/4 inch aluminum, 10 micron filter and mounting base. Choose the Standard Kit (18-7982-1) for a first-time install or straight kit replacement. Choose the Filter with Bonus Pack (18-7982-2) if you want a spare filter element included so the next scheduled filter change is already on hand.

Frequently Asked Questions

What does the Sierra 18-7982 fuel water separator kit remove from the fuel? It removes over 99.8% of emulsified water from gasoline and is over 90% efficient at capturing particles as small as 10 microns, protecting sensitive fuel-injection components from contamination.

What size fuel connections does this kit use? The Sierra 18-7982 kit is built around a 1/4 inch (6.4mm) aluminum tall-filter housing.

What is the difference between the 18-7982-1 and 18-7982-2 kits? 18-7982-1 is the standard kit with one 10 micron filter element and mounting base, while 18-7982-2 is the same kit with an added spare filter element for the next service change. Pick the bonus pack version if you want a replacement element already on hand.

What material is the filter housing made from? The housing is aluminum, matching the tall-filter design used across the 18-7982 kit.

How much fuel flow can the 18-7982 filter handle? Up to 90 gallons per hour, which is enough flow to feed high-demand fuel-injected marine engines.

What comes in the box with the Sierra 18-7982 kit? The standard kit includes one 18-7945 filter element and one 18-7853-1 mounting base; the bonus pack version includes those same parts plus a second, spare filter element.

Is the Sierra 18-7982 compatible with Mercury outboards? Yes, it cross-references to Mercury Marine part numbers 35-802893A4, 35-60494A4, 35-807172A4, 35-60494A1, 35-57250A1, 35-55501A1, and 35-52456A1.

What types of engines is this fuel water separator designed for? The 18-7982 kit is designed for gasoline fuel-injected inboard, sterndrive, and outboard engines to guard against water damage to the injection system.

Is the spare element in the bonus pack the same filter used in the standard kit? Yes, the 18-7982-2 filter with bonus pack uses the same 10 micron aluminum element as the standard 18-7982-1 kit, just with an extra one included.

Is this a genuine Sierra part or an aftermarket copy? The 18-7982 kit is a genuine Sierra-manufactured fuel water separator, sold as a direct cross-reference replacement for the listed Mercury part numbers.