Mercury – Quicksilver Water Pump Base Assembly | Reinforced Nylon Construction | 803750A01

Overview

A dependable cooling system starts with a solid foundation. The Mercury Marine 803750A01 Quicksilver Water Pump Base Assembly keeps your outboard’s cooling system working efficiently and reliably. Built from reinforced nylon with an integrated seal, this durable base is designed to deliver long-lasting performance while maintaining a tight, leak-free fit. It’s a direct OEM-quality replacement that helps your Mercury or Mariner FourStroke outboard stay cool and protected, season after season.

Key Features

• Purpose: Forms the foundation of your engine’s cooling system, ensuring steady water flow and sealing integrity.
• Construction: Made from reinforced nylon for strength and heat resistance.
• Design: Features an integrated seal to simplify installation and reduce potential leak points.
• Performance: Maintains proper cooling system pressure and durability in marine environments.
• Ease of Use: Direct-fit OEM design allows quick installation using standard tools.

Engine & Boat Compatibility

• Mercury and Mariner 8HP and 9.9HP FourStroke outboards
• Standard gearcase, model year 2005 and newer

Performance & Real-World Benefits

The 803750A01 water pump base assembly ensures a tight, reliable seal at the heart of your cooling system. Over time, base housings can warp or wear from constant pressure and heat, leading to reduced water flow or leaks. This OEM-quality replacement restores your system’s performance and peace of mind.

Its reinforced nylon construction is lightweight yet strong enough to withstand heat, vibration, and exposure to saltwater. Paired with an integrated seal, it’s designed to provide lasting protection without the need for extra sealing components.

Why Choose Mercury OEM

The Quicksilver 803750A01 is a genuine Mercury Marine part, built to match factory standards for precision, durability, and fit. Generic alternatives may not align perfectly or can use weaker plastics that deform over time.

Mercury’s OEM design ensures the right materials and tolerances for a dependable, leak-free installation — the same level of quality Mercury engineers demand in their new outboards.

FAQ

Q1: What’s included with the part?
The assembly comes complete with the water pump base and integrated seal.

Q2: Why replace the base assembly?
A worn or warped base can cause leaks or low water pressure, leading to poor engine cooling.

Q3: How is it built?
It’s made from reinforced nylon with a molded-in seal to handle marine heat and pressure.

Q4: Is installation difficult?
Not at all — it’s a direct-fit replacement that installs easily with standard hand tools.

Q5: Why OEM instead of aftermarket?
Mercury OEM components provide exact fit, tested strength, and proven reliability, ensuring your engine stays cool and efficient.