Sierra 18-3090 Impeller, White, for Evinrude/Johnson 2 HP Jr/Colt and 4 HP Outboards

The Sierra 18-3090 Impeller is a water pump impeller built to meet or exceed original equipment quality, designed as a direct fit for the specific Evinrude/Johnson outboard applications listed below. It is molded in white rubber compound and installs in the outboard's water pump housing to circulate raw water through the engine's cooling system, a wear part that should be checked and replaced on a regular service interval to prevent overheating.

This impeller is fit-specific to certain Evinrude/Johnson outboard horsepower ratings and model years, so buyers should confirm their engine's HP and year against the fitment listed here before ordering. It is interchangeable with several OEM and aftermarket cross-reference numbers, making it a straightforward replacement for outboard owners who know their original part number. Each Sierra impeller ships as a single unit ready for installation in the water pump housing.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3090
• Color: White
• Weight: 0.06 pounds
• UPC: 808282235000
• Unit Count: 1
• Category: Evinrude Outboard Water Pumps & Impellers

Fitment

• Evinrude/Johnson 2 HP Jr, Colt, 1985-90
• Evinrude/Johnson 4 HP, 1976-80

Replaces (OEM)

• GLM 89490
• Evinrude/Johnson 763735
• Evinrude/Johnson 387361
• Mallory 9-45210

Frequently Asked Questions

What outboards does the Sierra 18-3090 impeller fit? The Sierra 18-3090 impeller fits Evinrude/Johnson 2 HP Jr and Colt outboards from 1985-90 and Evinrude/Johnson 4 HP outboards from 1976-80. Confirm your engine's exact HP rating and model year before ordering, since this impeller is fit-specific.

Is the 18-3090 impeller interchangeable with OEM part numbers? Yes, the Sierra 18-3090 is interchangeable with GLM 89490, Evinrude/Johnson 763735, Evinrude/Johnson 387361, and Mallory 9-45210.

What color is the Sierra 18-3090 impeller? It is white, the standard color for this Sierra impeller part number.

How much does the Sierra 18-3090 impeller weigh? The Sierra 18-3090 impeller weighs 0.06 pounds.

How many impellers come in the package? One Sierra 18-3090 impeller ships per unit; the unit count listed for this part is 1.

Does the Sierra 18-3090 meet OEM quality standards? Sierra states this impeller meets or exceeds the quality of the original equipment part it replaces.

What is the UPC for the Sierra 18-3090 impeller? The UPC for the Sierra 18-3090 impeller is 808282235000.

Will the 18-3090 impeller work on any Evinrude/Johnson outboard? No, the 18-3090 is fit-specific to the 2 HP Jr/Colt (1985-90) and 4 HP (1976-80) Evinrude/Johnson outboards listed in its fitment; other horsepower ratings and years use a different Sierra part number.

What is the difference between the 18-3090 and other Sierra impellers in this HP range? The 18-3090 is specific to the 2 HP Jr/Colt (1985-90) and 4 HP (1976-80) applications; other model years and horsepower ratings within the same outboard family use different Sierra part numbers, so matching the exact year and HP is important.

What category of part is the Sierra 18-3090? The 18-3090 is listed under Evinrude Outboard Water Pumps & Impellers, indicating it is a water pump impeller for Evinrude/Johnson outboard engines.