Sierra Water Pump Kit 18-3394 for Johnson/Evinrude 40 HP (1989-98, 1999-Up) and 48 HP (1989-96) Outboards

The Sierra 18-3394 Water Pump Kit is a cooling system repair kit designed for the outboard's water pump housing assembly, restoring proper raw-water flow to the engine. As internal engine components age, water pump wear is a common cause of overheating, so replacing the kit at regular service intervals or at the first sign of reduced cooling flow helps protect the powerhead from heat-related damage. This kit is built to Sierra's outboard cooling system specifications and is cataloged specifically for Johnson/Evinrude (OMC/BRP) outboard engines within the HP and model-year ranges listed below. Installation follows standard outboard lower-unit water pump service procedures, replacing the wear components in the water pump housing as part of routine maintenance. Always confirm your outboard's exact HP rating and model year against the fitment listed before ordering, since Sierra offers different kit part numbers for other year ranges and HP outputs within the same engine family.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3394
• Category: Evinrude Outboard Water Pumps & Impellers
• UPC: 030999621627
• Weight: 0.93 pounds

Fitment

• Johnson/Evinrude (OMC/BRP) 40 HP, 1989-98
• Johnson/Evinrude (OMC/BRP) 40 HP, 1999-Up
• Johnson/Evinrude (OMC/BRP) 48 HP, 1989-96

Frequently Asked Questions

What engines does the Sierra 18-3394 water pump kit fit? The Sierra 18-3394 fits Johnson/Evinrude (OMC/BRP) outboards at 40 HP for model years 1989-98 and 1999-Up, and 48 HP for model years 1989-96.

Is the 18-3394 kit specific to a single HP rating? No, 18-3394 covers two different HP ratings, 40 HP and 48 HP, within the specific model years listed for those engines, so confirm both HP and year before ordering.

How much does the 18-3394 water pump kit weigh? The Sierra 18-3394 water pump kit weighs 0.93 pounds.

What category of part is 18-3394? It is listed under Evinrude Outboard Water Pumps & Impellers, functioning as a water pump kit for the outboard's cooling system.

Will 18-3394 work on a 1999 40 HP Evinrude? Yes, the fitment for the Sierra 18-3394 includes 40 HP Johnson/Evinrude outboards for model years 1999 and up.

Does 18-3394 fit a 40 HP outboard from the 1980s? No, 18-3394 is cataloged for 40 HP model years 1989-98 and 1999-Up; earlier 1980s 40 HP model years use a different Sierra water pump part number.

What is the UPC for the Sierra 18-3394 kit? The UPC for the Sierra 18-3394 water pump kit is 030999621627.

Is 18-3394 a genuine Sierra part number? Yes, 18-3394 is the Sierra manufacturer part number for this water pump kit, not a supplier or number.

Does the 18-3394 kit fit a 48 HP Evinrude from 1997? No, the 48 HP fitment for 18-3394 covers model years 1989-96, so a 1997 48 HP outboard falls outside the listed range for this part.

What should I check before ordering 18-3394 for my outboard? Confirm your Johnson/Evinrude outboard's exact HP rating and model year matches one of the listed ranges for 18-3394: 40 HP 1989-98, 40 HP 1999-Up, or 48 HP 1989-96.