Fuel Pump Assembly – Fits Tohatsu/Nissan 4-9.8 HP & Mercury/Mariner 4-6 HP 4-Stroke

Fuel Pump Assembly – Fits Tohatsu/Nissan 4-9.8 HP & Mercury/Mariner 4-6 HP 4-Stroke (Replaces 3H6-04000-7, 803529T06)

This fuel pump assembly is designed for a precise fit on a range of Tohatsu, Nissan, Mercury, and Mariner 4-stroke outboard motors. It fits Tohatsu/Nissan models from 4 HP to 9.8 HP and Mercury/Mariner models from 4 HP to 6 HP, ensuring reliable fuel delivery for optimal engine performance.

As a direct replacement, this assembly supersedes multiple Tohatsu and Mercury part numbers, including Tohatsu 3H6-04000-7 and Mercury 803529T06. It provides a straightforward solution for replacing old, worn, or malfunctioning fuel pumps.

• Installation: Installs as a direct OEM-style replacement.
• Fuel Compatibility: Designed for use with Gasoline.
• Housing: Constructed from a durable alloy for corrosion resistance.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across brands. This part is a direct replacement for the following OEM numbers.

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.

Technical Specifications

Package Contents

• 1 x Fuel Pump Assembly (Replaces 3H6-04000-7 / 803529T06)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is cool. Work in a well-ventilated area away from sparks or open flames.
2. Locate Fuel Pump: Identify the existing fuel pump on the engine block.
3. Prevent Spills: Place a rag or container under the fuel pump and clamp the fuel lines on both sides to minimize fuel leakage.
4. Disconnect Lines: Carefully disconnect the inlet and outlet fuel hoses from the pump. Note their orientation.
5. Remove Old Pump: Unbolt the mounting hardware securing the old pump and remove it from the engine.
6. Verify Fitment: Before installing, compare the new pump with your old one to ensure the fittings and mounting points match perfectly.
7. Install New Pump: Mount the new fuel pump onto the engine and tighten the bolts to the manufacturer's recommended torque.
8. Reconnect Lines: Attach the fuel inlet and outlet hoses to the correct ports on the new pump and secure the clamps.
9. Final Checks: Remove the clamps from the fuel lines. Reconnect the battery.
10. Prime and Test: Prime the fuel system according to your engine's manual. Start the engine and carefully inspect the pump and connections for any leaks.

Troubleshooting & FAQ

How do I confirm this fits my engine?

The best way is to match your original part number to the numbers in our Part Number Cross-Reference table. You can also check your engine model against the compatibility lists. If you're still unsure, inspect the product photos to visually match them with your existing part.

My original part number is 3H6-04000-3. Will this part work?

Yes. This fuel pump, 3H6-04000-7, is the direct supersession for all previous versions from 3H6-04000-0 through 3H6-04000-6. It will fit and function correctly.

What are the common signs of a failing fuel pump?

Symptoms of a bad fuel pump include difficulty starting the engine, stalling at low speeds, rough idling, engine sputtering at high speeds, or a noticeable loss of power. A visual inspection may also reveal cracks or fuel leaks on the pump housing.

OEM vs. Aftermarket?

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.

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

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.

What is your warranty and return policy?

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.