Mercury - Quicksilver Water Pump Impeller Repair Kit For 8-9.9HP 4-Stroke Outboards 803748Q01. Overview. A healthy water pump means a cool, reliable engine - and the Mercury Marine 803748Q01 Quicksilver Water Pump Impeller Repair Kit makes it easy to keep it that way. Designed for 2005 and newer Mercury and Mariner 8-9.9HP 4-Stroke outboards, this 6-piece kit includes everything you need to restore proper water circulation and cooling performance. Each component is made to Mercury's strict OEM s