Fuel Pump – Fits Mercury/Mariner 4-Stroke 4HP, 5HP, 6HP Outboards (Replaces 803529T06, 803529T01, 803529T02, 803529T03)

Fuel Pump – Fits Mercury/Mariner 4-Stroke 4HP, 5HP, 6HP Outboards

This fuel pump is designed to fit Mercury/Mariner 4HP, 5HP, and 6HP 4-stroke outboard engines. It serves as a reliable aftermarket replacement for your original fuel pump, ensuring proper fuel delivery and engine performance.

This component directly replaces OEM part numbers, including Mercury/Mariner 803529T06, 803529T01, 803529T02, 803529T03, and Tohatsu 3H6-04000-7.

• Installation: Direct OEM Replacement
• Compatibility: Fits Mercury, Mariner, and Tohatsu 4-Stroke models (4HP, 5HP, 6HP)
• Fuel Type: Designed for use with Gasoline

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Fuel Pump (Replaces 803529T06 / 803529T01 / 803529T02 / 803529T03)

Installation Guide

1. Disconnect the battery to prevent electrical hazards.
2. Locate the existing fuel pump on the engine block.
3. Place a rag or container underneath the pump to catch any spilled fuel.
4. Carefully disconnect the fuel lines from the pump. Note their orientation.
5. Unbolt and remove the old fuel pump from the engine.
6. Clean the mounting surface to ensure a proper seal.
7. Install the new fuel pump, ensuring it is correctly seated.
8. Securely fasten the mounting bolts to the manufacturer's specified torque.
9. Reconnect the fuel lines to the correct ports on the new pump.
10. Reconnect the battery.
11. Prime the fuel system if necessary and check for any leaks before starting the engine.

Troubleshooting & FAQ

Q: How do I know if this fuel pump fits my outboard?

A: This pump is designed for Mercury, Mariner, and Tohatsu 4-stroke outboards in the 4HP, 5HP, and 6HP range. Check the "Compatible Engine Models" and "Part Number Cross-Reference" tables to confirm it matches your specific engine and original part number (e.g., 803529T06, 3H6-04000-7).

Q: What are the symptoms of a failing fuel pump?

A: Common signs include the engine failing to start, sputtering or losing power at high speeds, stalling, or surging unexpectedly.

Q: Is this a mechanical or electric fuel pump?

A: This is a mechanical fuel pump, driven by the engine's internal components.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.