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Fuel Pump for Tohatsu Nissan MFS NSF 4-9.8 HP 3H6-04000-0
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Fuel Pump – Fits Tohatsu/Nissan 4-9.8 HP 4-Stroke (Replaces 3H6-04000-0)
This fuel pump assembly is designed for a range of Tohatsu, Nissan, Mercury, and Mariner 4-stroke outboards. It fits Tohatsu and Nissan models from 4 HP to 9.8 HP and is compatible with Mercury and Mariner outboards from 4 HP to 6 HP.
It serves as a direct replacement for Tohatsu part numbers 3H6-04000-0 through 3H6-04000-7, and Mercury part numbers including 803529T06, 803529T1, 803529T02, and 803529T03.
- Installation Method: Direct OEM Replacement
- Compatible Fuel Type: Gasoline
- Quality Standard: Produced in an ISO9002 certified facility
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| 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 | Current Part Number | |
| Mercury/Mariner | 803529T06 | Also replaces 803529T1, 803529T02, 803529T03 |
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 | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Tohatsu | MFS4A2 | 4 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS4B | 4 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS5A2 | 5 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS5B | 5 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS6A2 | 6 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS6B | 6 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS8A | 8 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS8A2 | 8 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS8A3 | 8 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS9.8A | 9.8 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS9.8A2 | 9.8 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Tohatsu | MFS9.8A3 | 9.8 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Nissan | NSF4A2 | 4 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Nissan | NSF5A2 | 5 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Nissan | NSF6A2 | 6 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Nissan | NSF8A | 8 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
| Nissan | NSF9.8A | 9.8 | 4-Stroke | 3H6-04000-7 | Supersedes earlier -0 through -6 versions |
Mercury/Mariner
| Brand | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Mercury | 4 | 4-Stroke | 803529T06 | Also uses 803529T1, 803529T02, 803529T03 |
| Mercury | 5 | 4-Stroke | 803529T06 | Also uses 803529T1, 803529T02, 803529T03 |
| Mercury | 6 | 4-Stroke | 803529T06 | Also uses 803529T1, 803529T02, 803529T03 |
| Mariner | 4 | 4-Stroke | 803529T06 | Also uses 803529T1, 803529T02, 803529T03 |
| Mariner | 5 | 4-Stroke | 803529T06 | Also uses 803529T1, 803529T02, 803529T03 |
| Mariner | 6 | 4-Stroke | 803529T06 | Also uses 803529T1, 803529T02, 803529T03 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Fuel Pump Assembly |
| Installation | Direct OEM Replacement |
| Fuel Type | Gasoline |
| Housing Material | Alloy |
| Housing Color | Silver/Metallic |
| Other Technical Attributes | Production Standard: ISO9002 certified factory |
| Warranty | Varies by retailer |
Package Contents
- 1 x Fuel Pump Assembly (3H6-04000-7/3H6-04000-0)
Explosion Diagram
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 any pressure in the fuel system according to your engine's service manual.
- Disconnect Lines: Carefully disconnect the fuel inlet and outlet lines from the pump. Have rags ready to catch any residual fuel.
- Remove Old Pump: Unbolt and remove the old fuel pump assembly from the engine block. Note the orientation of fittings.
- Install New Pump: Mount the new fuel pump assembly, ensuring any gaskets or seals are correctly positioned. Torque the mounting bolts to the manufacturer's specification.
- Reconnect Lines: Securely attach the fuel lines to the new pump. Ensure all connections are tight to prevent leaks.
- Prime and Test: Reconnect the battery. Prime the fuel system using the primer bulb until firm. Start the engine and carefully inspect the pump and connections for any signs of fuel leaks.
Troubleshooting & FAQ
Q: How do I know if this fuel pump will fit my outboard?
A: First, check your engine's horsepower and confirm it is listed in the compatible models tables (e.g., Tohatsu MFS8A3, Mercury 5 HP 4-Stroke). Second, verify your existing fuel pump's part number against our cross-reference list. This pump replaces Tohatsu numbers like 3H6-04000-7 and Mercury numbers like 803529T06.
Q: What are the common symptoms of a bad fuel pump?
A: Signs of a failing fuel pump include the engine struggling to start, sputtering or losing power at high speeds, unexpected stalling, and poor overall performance. A physical inspection might also reveal fuel leaks around the pump body.
Q: Is this a genuine Tohatsu/Mercury part?
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.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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