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Description
Fuel Pump – Fits Tohatsu/Nissan MFS/NSF 4-9.8 HP & Mercury/Mariner 4-6 HP 4-Stroke (Replaces 3H6-04000-7)Fuel Pump Fits Tohatsu Nissan MFS NSF 4 9. 8 HP & Mercury Mariner 4 6 HP 4 Stroke This aftermarket fuel pump assembly is designed for a precise fit on a range of Tohatsu, Nissan, Mercury, and Mariner 4 stroke outboard motors. It serves as a direct replacement for engines from 4 HP to 9. 8 HP, ensuring reliable fuel delivery and restoring engine performance. This part replaces multiple OEM part numbers, including Tohatsu Nissan 3H6 04000 7 and Mercury
Fuel Pump – Fits Tohatsu/Nissan MFS/NSF 4-9.8 HP & Mercury/Mariner 4-6 HP 4-Stroke
This aftermarket fuel pump assembly is designed for a precise fit on a range of Tohatsu, Nissan, Mercury, and Mariner 4-stroke outboard motors. It serves as a direct replacement for engines from 4 HP to 9.8 HP, ensuring reliable fuel delivery and restoring engine performance.
This part replaces multiple OEM part numbers, including Tohatsu/Nissan 3H6-04000-7 and Mercury/Mariner 803529T06. Please verify the part number cross-reference and compatible models list to ensure correct fitment for your specific engine.
- Installation Method: Direct OEM-style replacement.
- Compatible Fuel Type: Gasoline.
- Package Includes: 1 x Fuel Pump Assembly.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number | Superseded By |
|---|---|---|
| Tohatsu/Nissan | 3H6-04000-0 | 3H6-04000-7 |
| Tohatsu/Nissan | 3H6-04000-1 | 3H6-04000-7 |
| Tohatsu/Nissan | 3H6-04000-2 | 3H6-04000-7 |
| Tohatsu/Nissan | 3H6-04000-3 | 3H6-04000-7 |
| Tohatsu/Nissan | 3H6-04000-4 | 3H6-04000-7 |
| Tohatsu/Nissan | 3H6-04000-5 | 3H6-04000-7 |
| Tohatsu/Nissan | 3H6-04000-6 | 3H6-04000-7 |
| Tohatsu/Nissan | 3H6-04000-7 | - |
| Mercury/Mariner | 803529T01 | 803529T06 |
| Mercury/Mariner | 803529T02 | 803529T06 |
| Mercury/Mariner | 803529T03 | 803529T06 |
| Mercury/Mariner | 803529T06 | - |
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.
Tohatsu/Nissan
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Tohatsu | MFS4A2 | 4 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Tohatsu | MFS4B | 4 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Tohatsu | MFS4C | 4 | 4-Stroke | 2011-2014 | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 |
| Tohatsu | MFS5A2 | 5 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Tohatsu | MFS5B | 5 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Tohatsu | MFS5C | 5 | 4-Stroke | 2011-2014 | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 |
| Tohatsu | MFS6A2 | 6 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Tohatsu | MFS6B | 6 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Tohatsu | MFS6C | 6 | 4-Stroke | 2011-2014 | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 |
| Tohatsu | MFS8A | 8 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Tohatsu | MFS8A2 | 8 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Tohatsu | MFS8A3 | 8 | 4-Stroke | 2006-2014 | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 |
| Tohatsu | MFS9.8A | 9.8 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Tohatsu | MFS9.8A2 | 9.8 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Tohatsu | MFS9.8A3 | 9.8 | 4-Stroke | 2006-2014 | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 |
| Nissan | NSF4A2 | 4 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Nissan | NSF4B | 4 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Nissan | NSF4C | 4 | 4-Stroke | 2011-2014 | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 |
| Nissan | NSF5A2 | 5 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Nissan | NSF5B | 5 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Nissan | NSF5C | 5 | 4-Stroke | 2011-2014 | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 |
| Nissan | NSF6A2 | 6 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Nissan | NSF6B | 6 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Nissan | NSF6C | 6 | 4-Stroke | 2011-2014 | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 |
| Nissan | NSF8A | 8 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Nissan | NSF8A2 | 8 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Nissan | NSF8A3 | 8 | 4-Stroke | 2006-2014 | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 |
| Nissan | NSF9.8A | 9.8 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Nissan | NSF9.8A2 | 9.8 | 4-Stroke | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 | |
| Nissan | NSF9.8A3 | 9.8 | 4-Stroke | 2006-2014 | 3H6-04000-7 | Supersedes 3H6-04000-0 through 3H6-04000-6 |
Mercury/Mariner
| Brand | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Mercury | 4 | 4-Stroke | 803529T06 | Also listed as 803529T01, 803529T02, 803529T03 |
| Mercury | 5 | 4-Stroke | 803529T06 | Also listed as 803529T01, 803529T02, 803529T03 |
| Mercury | 6 | 4-Stroke | 803529T06 | Also listed as 803529T01, 803529T02, 803529T03 |
| Mariner | 4 | 4-Stroke | 803529T06 | Also listed as 803529T01, 803529T02, 803529T03 |
| Mariner | 5 | 4-Stroke | 803529T06 | Also listed as 803529T01, 803529T02, 803529T03 |
| Mariner | 6 | 4-Stroke | 803529T06 | Also listed as 803529T01, 803529T02, 803529T03 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Fuel Pump Assembly |
| Installation | Direct OEM Replacement |
| Fuel Type | Gasoline |
| Connection | Hose Barb |
| Housing Material | Alloy/Plastic |
| Housing Color | Black/Silver |
| Fitting Type | Hose Barb |
| Warranty | 1 Year (Aftermarket) |
| Production Standard | ISO9002 certified factory |
Package Contents
- 1 x Fuel Pump Assembly (Replaces 3H6-04000-7)
Installation Guide
- Safety First: Disconnect the battery and ensure the engine is cool. Work in a well-ventilated area away from open flames or sparks.
- Relieve Fuel Pressure: Safely relieve the pressure from the fuel system according to your engine's service manual to prevent fuel spray.
- Disconnect Fuel Lines: Place a rag under the fuel pump to catch any residual fuel. Carefully disconnect the inlet and outlet fuel lines from the pump.
- Remove Old Pump: Unscrew the mounting bolts holding the fuel pump to the engine block.
- Install New Pump: Position the new fuel pump and secure it with the mounting bolts, tightening them to the manufacturer's specified torque.
- Reconnect Fuel Lines: Attach the fuel lines to the new pump, ensuring a secure connection to prevent leaks.
- Prime and Test: Reconnect the battery. Prime the fuel system by squeezing the primer bulb until firm. Start the engine and carefully inspect for any fuel leaks around the pump and connections.
Troubleshooting & FAQ
Q: How can I confirm this fuel pump fits my specific engine?
A: The best way is to match your original part number to one of the numbers in our "Part Number Cross-Reference" table. Additionally, check your engine's model and year against the "Compatible Engine Models" list. If you're unsure, use the provided guides for Mercury to find your serial number or consult a parts diagram.
Q: What are the common signs of a failing fuel pump?
A: Symptoms of a faulty fuel pump include the engine sputtering or surging, bogging down under acceleration, difficulty starting, or a complete loss of power. These issues occur when the pump can no longer supply the carburetor with a consistent and adequate flow of fuel.
Q: Why are there so many superseded part numbers for this pump?
A: Manufacturers often update part designs over time for improved durability, material changes, or minor functional enhancements. A new part number (e.g., 3H6-04000-7) supersedes the older versions, meaning it is the current and correct replacement for all previous iterations.
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy