Fuel Pump – Fits Tohatsu/Nissan/Mercury 4-9.8HP 4-Stroke (Replaces 3H6-04000-7, 803529T06)
Fuel Pump – Fits Tohatsu/Nissan/Mercury 4-9.8HP 4-Stroke (Replaces 3H6-04000-7, 803529T06) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Fuel Pump – Fits Tohatsu/Nissan/Mercury 4-9.8HP 4-Stroke (Replaces ...
Product Details
This aftermarket Fuel Pump – Fits Tohatsu/Nissan/Mercury 4-9.8HP 4-Stroke (Replaces 3H6-04000-7, 803529T06) is engineered for a range of 4-stroke outboard motors, including Tohatsu, Nissan, and Mercury/Mariner models rated between 4HP and 9.8HP. It provides a reliable fuel supply for consistent engine performance.
The part serves as a direct interchange for Tohatsu references 3H6-04000-7, 3H6-04000-3, and 3H6-04000-4, as well as Mercury equivalents 803529T06 and 803529T01 through 803529T05.
- Designed for direct OEM replacement fit and function.
- Features a durable aluminum housing for corrosion resistance in marine environments.
- Includes a new O-ring and hose clamp required for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Tohatsu | 3H6-04000-7 |
| Tohatsu | 3H6-04000-3 |
| Tohatsu | 3H6-04000-4 |
| Mercury | 803529T06 |
| Mercury | 803529T01 |
| Mercury | 803529T02 |
| Mercury | 803529T03 |
| Mercury | 803529T04 |
| Mercury | 803529T05 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fits various Tohatsu 4-stroke models from 4HP to 9.8HP, including the MFS4B.
Compatible with Nissan 4-stroke outboards in 4HP, 5HP, and 6HP ratings.
Installs on Mercury & Mariner 4-stroke engines from 4HP to 9.8HP.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Tohatsu | Multiple Models | 4.0 | 4-Stroke | 3H6-04000-7 | ||
| Tohatsu | Multiple Models | 5.0 | 4-Stroke | 3H6-04000-7 | ||
| Tohatsu | Multiple Models | 6.0 | 4-Stroke | 3H6-04000-7 | ||
| Tohatsu | Multiple Models | 9.8 | 4-Stroke | 3H6-04000-7 | ||
| Tohatsu | MFS4B | 4.0 | 4-Stroke | 2010 | 3H6-04000-4 | Mark D variant |
| Nissan | Multiple Models | 4.0 | 4-Stroke | 3H6-04000-7 | ||
| Nissan | Multiple Models | 5.0 | 4-Stroke | 3H6-04000-7 | ||
| Nissan | Multiple Models | 6.0 | 4-Stroke | 3H6-04000-7 | ||
| Mercury | Multiple Models | 4.0 | 4-Stroke | 803529T06 | ||
| Mercury | Multiple Models | 5.0 | 4-Stroke | 803529T06 | ||
| Mercury | Multiple Models | 6.0 | 4-Stroke | 803529T06 | ||
| Mercury | Multiple Models | 8.0 | 4-Stroke | 803529T06 | ||
| Mercury | Multiple Models | 9.8 | 4-Stroke | 803529T06 |
Technical Specs
- Product Type
- Fuel Pump
- Installation
- Direct OEM Replacement
- Fuel Type
- Gasoline
- Housing Material
- Metal (Aluminum)
- Housing Color
- Silver
- Dimensions
- 10 x 9 x 6 cm (packaging dimensions)
- Weight
- 176g (0.39 lb)
- Warranty
- 1 Year (varies by seller)
What’s in the Box
- 1 x Fuel Pump (3H6-04000-7/3H6-04000-3)
- 1 x Hose Clamp (95395) - 9x1mm
- 1 x O-ring (803513) - 2.4x20mm inner diameter
Installation Notes
- Ensure the engine is cool and disconnect the battery's negative terminal.
- Turn off the fuel supply valve and safely relieve any pressure in the fuel system.
- Place a rag under the old pump to catch any spilled fuel.
- Carefully disconnect the fuel inlet and outlet lines from the pump.
- Remove the mounting bolts securing the old pump and remove it from the engine.
- Thoroughly clean the mounting surface on the engine block.
- Install the new O-ring and mount the new fuel pump, tightening bolts to the manufacturer's torque specification.
- Securely reconnect the fuel lines and new hose clamp.
- Turn the fuel supply on, reconnect the battery, and prime the fuel system.
- Before starting the engine, carefully inspect for any fuel leaks around the pump and its connections.
Troubleshooting & FAQ
How do I know if this fuel pump fits my engine?
Refer to the Engine & Model Compatibility table and Part Number Matrix. This pump is designed for specific Tohatsu, Nissan, and Mercury 4-stroke models from 4HP to 9.8HP. Always compare the part numbers and images to your original pump before ordering.
What are the signs of a failing fuel pump?
Common symptoms include difficulty starting the engine, sputtering or hesitation at high speeds, unexpected loss of power, or the engine stalling completely. You might also notice fuel leaks on or around the pump housing, indicating a seal failure.
What is the recommended replacement interval for this pump?
Outboard fuel pumps do not have a fixed replacement schedule. They are typically replaced when they fail or show signs of wear. Regular inspection during annual service is recommended to check for leaks or performance issues.
Are special tools required for installation?
Installation can typically be completed with basic hand tools such as a socket/wrench set and pliers. A torque wrench is recommended to ensure the mounting bolts are tightened to the correct OEM specification, preventing leaks and damage.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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