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Description
Fuel Pump – Fits Mercury/Tohatsu/Nissan 9.9-30 HP & Johnson/Evinrude 15 HP (Replaces 803529T04, 3H8-04000-1)Fuel Pump Assembly Fits Mercury Tohatsu Nissan 9. 9 30 HP & Johnson Evinrude 15 HP This pulse driven mechanical fuel pump is a reliable aftermarket replacement for a wide range of outboard motors, including 4 stroke models from Mercury Mariner (9. 9 30 HP, 2005present) and Tohatsu Nissan (9. 9 30 HP, 20022018). It also offers limited compatibility with select Johnson Evinrude 15 HP 2 stroke models. Engineered to meet or exceed OEM specifications, this
Fuel Pump Assembly – Fits Mercury/Tohatsu/Nissan 9.9-30 HP & Johnson/Evinrude 15 HP
This pulse-driven mechanical fuel pump is a reliable aftermarket replacement for a wide range of outboard motors, including 4-stroke models from Mercury/Mariner (9.9-30 HP, 2005–present) and Tohatsu/Nissan (9.9-30 HP, 2002–2018). It also offers limited compatibility with select Johnson/Evinrude 15 HP 2-stroke models.
Engineered to meet or exceed OEM specifications, this pump ensures consistent fuel delivery for optimal engine performance. It serves as a direct replacement for Mercury part 803529T04, Tohatsu/Nissan part 3H8-04000-1, and Johnson/Evinrude part 5041064.
- Installation: Mounts easily with a standard two-bolt system.
- Fuel System: Compatible with standard marine gasoline.
- Complete Kit: Includes the fuel pump, O-ring, and spring clamps for a full replacement.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury/Mariner | 803529T04 | Replaces 803529A04 |
| Tohatsu/Nissan | 3H8-04000-1 | Also known as 3H8040001, 3H8040001M |
| Johnson/Evinrude | 5041064 | Limited compatibility |
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. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson Serial Number Guide.
Confirm your engine model/year in the table below.
Mercury/Mariner
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Various 4-Stroke | 9.9 | 4-Stroke | 2005–Present | 803529T04 | Replaces 803529A04 |
| Mercury | Various 4-Stroke | 15 | 4-Stroke | 2005–Present | 803529T04 | Replaces 803529A04 |
| Mercury | Various 4-Stroke | 20 | 4-Stroke | 2005–Present | 803529T04 | Replaces 803529A04 |
| Mercury | Various 4-Stroke | 25 | 4-Stroke | 2005–Present | 803529T04 | Replaces 803529A04 |
| Mercury | Various 4-Stroke | 30 | 4-Stroke | 2005–Present | 803529T04 | Replaces 803529A04 |
Tohatsu/Nissan
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Tohatsu | MFS9.9E EFI | 9.9 | 4-Stroke | 2017-2018 | 3H8-04000-1 | Fuel Pump |
| Tohatsu | MFS9.9B, MFS9.9B2 | 9.9 | 4-Stroke | 2002-2004 | 3H8-04000-1 | Inlet Manifold, Fuel Pump |
| Tohatsu | MFS15E EFI | 15 | 4-Stroke | 2017-2018 | 3H8-04000-1 | Fuel Pump |
| Tohatsu | MFS15B, MFS15B2, MFS15C | 15 | 4-Stroke | 2002-2012 | 3H8-04000-1 | Inlet Manifold, Fuel Pump |
| Tohatsu | MFS20E EFI | 20 | 4-Stroke | 2017-2018 | 3H8-04000-1 | Fuel Pump |
| Tohatsu | MFS20C, MFS20D | 20 | 4-Stroke | 2011-2016 | 3H8-04000-1 | Inlet Manifold, Fuel Pump |
| Tohatsu | MFS25A | 25 | 4-Stroke | 2002-2005 | 3H8-04000-1 | Inlet Manifold, Fuel Pump |
| Tohatsu | MFS25B | 25 | 4-Stroke | 2006-2014 | 3H8-04000-1 | Fuel Pump, Fuel Rail & Vapor Separator |
| Tohatsu | MFS25C | 25 | 4-Stroke | 2015-2018 | 3H8-04000-1 | Fuel System |
| Tohatsu | MFS30A | 30 | 4-Stroke | 2002-2005 | 3H8-04000-1 | Inlet Manifold, Fuel Pump |
| Tohatsu | MFS30B | 30 | 4-Stroke | 2005-2014 | 3H8-04000-1 | Fuel Pump, Fuel Rail & Vapor Separator |
| Tohatsu | MFS30C | 30 | 4-Stroke | 2015-2018 | 3H8-04000-1 | Fuel System |
| Nissan | NSF9.9B, NSF9.9B2 | 9.9 | 4-Stroke | 2002-2004 | 3H8-04000-1 | Inlet Manifold, Fuel Pump |
| Nissan | NSF15B, NSF15B2, NSF15C | 15 | 4-Stroke | 2002-2013 | 3H8-04000-1 | Inlet Manifold, Fuel Pump |
| Nissan | NSF20C | 20 | 4-Stroke | 2008 | 3H8-04000-1 | Inlet Manifold, Fuel Pump |
| Nissan | NSF25A | 25 | 4-Stroke | 2002-2005 | 3H8-04000-1 | Inlet Manifold, Fuel Pump |
| Nissan | NSF25B | 25 | 4-Stroke | 2006-2014 | 3H8-04000-1 | Fuel Pump, Fuel Rail & Vapor Separator |
| Nissan | NSF30A | 30 | 4-Stroke | 2002-2005 | 3H8-04000-1 | Inlet Manifold, Fuel Pump |
| Nissan | NSF30B | 30 | 4-Stroke | 2005-2014 | 3H8-04000-1 | Fuel Pump, Fuel Rail & Vapor Separator |
Johnson/Evinrude
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson | Various Models | 15 | 2-Stroke | 1993-2007 | 5041064 | Limited compatibility |
| Evinrude | Various Models | 15 | 2-Stroke | 1993-2007 | 5041064 | Limited compatibility |
Technical Specifications
| Product Type | Mechanical Fuel Pump |
| Installation | Two-bolt mounting system |
| Fuel Type | Gasoline |
| Connection | Hose barb fittings |
| Housing Material | Corrosion-resistant metal and plastic |
| Housing Color | Black/Silver |
| Dimensions | Approximately 89 × 76 × 38 mm (3.5 × 3.0 × 1.5 inches) |
| Weight | 0.07 kg (0.15 lbs) |
| Fitting Type | Hose Barb |
| Working Pressure | Meets OEM specifications |
| Operating Temperature | -20 to 80°C (-4 to 176°F) |
| Other Technical Attributes | Pulse-driven mechanical pump |
Package Contents
- 1x Fuel Pump Assembly (803529T04/3H8-04000-1)
- 1x O-Ring
- 2x Metal Spring Clamps
Installation Guide
- Safety First: Disconnect the battery and ensure the engine is cool. Work in a well-ventilated area and have a fire extinguisher nearby.
- Locate Pump: Identify the existing fuel pump on the engine block.
- Disconnect Lines: Place a rag under the pump to catch fuel. Carefully disconnect the inlet and outlet fuel lines, noting their orientation.
- Remove Old Pump: Unbolt the two mounting bolts holding the pump in place and remove the pump and old O-ring/gasket.
- Install New Pump: Clean the mounting surface on the engine. Place the new O-ring and install the new fuel pump, tightening the bolts evenly.
- Reconnect Lines: Attach the fuel lines to the correct fittings on the new pump and secure them with the provided spring clamps.
- Test for Leaks: Reconnect the battery. Prime the fuel system if necessary and check thoroughly for any fuel leaks around the pump and fittings before starting the engine.
Troubleshooting & FAQ
Q: How do I confirm this pump fits my specific engine model?
A: The best way is to match your existing part number to the ones listed in our cross-reference table (803529T04, 3H8-04000-1, 5041064). Additionally, review the compatible engine model tables on this page to ensure your engine's make, HP, and year range are listed.
Q: What are common signs that my fuel pump is failing?
A: Common symptoms of a failing mechanical fuel pump include engine sputtering, loss of power especially at high speeds, difficulty starting, or stalling. You may also notice fuel leaking from the pump body itself.
Q: How often should I replace my fuel pump?
A: There is no fixed replacement interval, but fuel pumps are a critical wear item. Consider a replacement as part of preventative maintenance, especially on older engines or if you experience any performance issues.
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