Aftermarket Fuel Pump Assembly for Tohatsu MFS 4–9.8 HP 4-Stroke Outboards – Replaces 3H6-04000-7
Aftermarket Fuel Pump Assembly for Tohatsu MFS 4–9.8 HP 4-Stroke Outboards – Replaces 3H6-04000-7 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Aftermarket Fuel Pump Assembly for Tohatsu MFS 4–9.8 HP 4-Stroke Ou...
Aftermarket Fuel Pump Assembly for Tohatsu MFS 4–9.8 HP 4-Stroke Outboards – Replaces 3H6-04000-7 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket fuel pump assembly is designed as a replacement for selected Tohatsu MFS 4-stroke outboard engines from 4 HP through 9.8 HP. Catalog applications identify the replacement part number 3H6-04000-7 in the fuel-pump diagrams for the Tohatsu model and year ranges listed below.
Use the exact engine model, year, and existing fuel-pump part number to confirm compatibility before ordering. This listing is for a single aftermarket fuel pump assembly, not a complete fuel-system kit.
- Aftermarket replacement fuel pump assembly.
- Direct-replacement design for the listed Tohatsu applications.
- For gasoline 4-stroke outboard fuel systems.
- Compare the original pump, hose routing, mounting arrangement, model, and year before installation.
Part Number Reference
The verified catalog occurrences for this product identify the following manufacturer part number:
| Brand | Manufacturer Part Number | Component |
|---|---|---|
| Tohatsu | 3H6-04000-7 | Fuel Pump Assembly |
Earlier or alternative numbers should not be treated as confirmed equivalents without matching the engine model, year, and original pump. Number co-occurrence alone does not establish interchangeability.
Engine & Model Compatibility
The following applications are supported by catalog occurrences for manufacturer part number 3H6-04000-7. Model, horsepower, stroke, and year conditions must be considered together.
| Brand | Model Family | Rated HP | Stroke | Catalog Years | Part No. |
|---|---|---|---|---|---|
| Tohatsu | MFS4/5/6C | 4–6 HP | 4-Stroke | 2013–2019 | 3H6-04000-7 |
| Tohatsu | MFS4/5/6D | 4–6 HP | 4-Stroke | 2020–2026 | 3H6-04000-7 |
| Tohatsu | MFS8/9.8A3 | 8–9.8 HP | 4-Stroke | 2013–2014 | 3H6-04000-7 |
| Tohatsu | MFS6/8/9.8A3 | 6–9.8 HP | 4-Stroke | 2015–2016 | 3H6-04000-7 |
| Tohatsu | MFS6BZ/8B/9.8B | 6–9.8 HP | 4-Stroke | 2016–2024 | 3H6-04000-7 |
Compatibility is not confirmed for every Tohatsu 4–9.8 HP model, every Nissan-branded equivalent, or every Mercury/Mariner model. If your model or year is not listed, verify the original pump number and application with a qualified marine-parts professional before ordering.
Technical Specs
- Product Type
- Fuel Pump Assembly
- Construction
- Aftermarket replacement component
- Installation
- Direct replacement for listed applications
- Fuel Type
- Gasoline
- Connection
- Hose barb
- Fitting Type
- Hose barb
- Housing Material
- Alloy/plastic
- Housing Color
- Black/silver
- Manufacturer Part Number
- 3H6-04000-7
- Warranty
- 1-year aftermarket warranty
- Production Standard
- Manufactured in an ISO9002-certified facility
What's in the Box
- 1 x Fuel Pump Assembly
No additional hoses, clamps, gaskets, mounting hardware, or other fuel-system components are included unless specifically shown or stated in the order details.
Installation Notes
- Ensure the engine is switched off and cool. Work outdoors or in a well-ventilated area away from flames, sparks, and other ignition sources.
- Relieve fuel-system pressure and place an approved container beneath the fuel connections before disconnecting any line.
- Record the orientation of the inlet, outlet, and any vacuum or pulse lines connected to the original pump.
- Disconnect the fuel lines and remove the original pump according to the engine service manual.
- Inspect the hoses, clamps, mounting surface, and related fuel-system components for damage, contamination, or deterioration.
- Install the replacement pump in the correct orientation. Reuse or replace mounting hardware only as specified by the service manual.
- Reconnect every hose to the correct port and secure the connections properly. Do not kink or stretch the fuel lines.
- Prime the fuel system according to the engine manufacturer's procedure.
- Before operating the boat, start the engine and inspect the pump and all connections for fuel leaks. Stop immediately if a leak is found.
Troubleshooting & FAQ
How do I know if this fuel pump fits my engine?
Match all of the following: the exact engine model family, horsepower, 4-stroke configuration, year, and the part number on your original pump. The listed catalog applications use manufacturer part number 3H6-04000-7. If any detail differs, obtain confirmation before ordering.
Does this fit every Tohatsu or Nissan 4–9.8 HP outboard?
No. The broad horsepower range is not sufficient by itself. Confirmed applications are limited to the Tohatsu model families and catalog years shown on this page. Nissan-branded and other related applications should not be assumed to fit without an exact part-number and model match.
Does this fit Mercury or Mariner outboards?
Mercury and Mariner applications are not confirmed on this revised listing. Do not rely on a general powerhead similarity or a visual match; verify the exact engine model, year, and original fuel-pump number first.
What are common signs of a failing fuel pump?
Possible symptoms include hard starting, engine sputtering, loss of power under load, fuel starvation during acceleration, or an engine that stalls after running. Check the fuel supply, filter, hoses, and other related components before replacing the pump.
Is there a recommended replacement interval?
There is no universal replacement interval for this type of outboard fuel pump. Inspect the fuel system during routine maintenance and replace the pump if it fails, leaks, or shows signs of deterioration.
Can I install this fuel pump myself?
Installation may be suitable for an experienced mechanic, but it involves gasoline and requires correct hose routing and leak testing. Follow the engine service manual and use professional installation if you are not confident working on marine fuel systems.
Is this an OEM part?
No. This listing is for an aftermarket replacement fuel pump assembly. The manufacturer part number is provided only as an application reference.
Warranty and returns
This part carries a 1-year aftermarket warranty against manufacturing defects under normal use. Returns are accepted within the standard return window for unused items in their original condition. Contact support with your order details for warranty or return instructions.
Safety & Important Information
- Verify the exact model, year, stroke, horsepower, and original part number before purchase.
- Do not operate the engine if any fuel connection leaks.
- Use only fuel-system-compatible hoses, clamps, and sealing components.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended when working on a marine fuel system.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable service in real-world conditions.
- Fast Global Fulfillment — Standard delivery is available to most regions; delivery options and estimated transit times appear at checkout.
- Manufacturer-Direct Value — Fair pricing with practical replacement solutions for marine maintenance.
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