Carburetor Assembly – Fits Tohatsu/Nissan 8-9.8HP (Replaces 3DP-03100-0)

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Carburetor Assembly – Fits Tohatsu/Nissan 8-9.8HP (Replaces 3DP-03100-0) is backordered and will ship as soon as it is back in stock.

Worry-free returns

You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This aftermarket Carburetor Assembly – Fits Tohatsu/Nissan 4-Stroke 8HP & 9.8HP (Replaces 3DP-03100-0) offers a precision-engineered solution for Tohatsu, Nissan, and compatible Mercury/Mariner 4-stroke outboard engines. It’s designed for a reliable fit on 8HP MFS8/NSF8 and 9.8HP MFS9.8 models from 2003 and newer, restoring original fuel delivery performance.

This unit serves as a direct interchange for numerous Tohatsu part numbers, including 3DP-03100-0, 3DP-03133-0, 3V2-03100-2, 3V2-03133-2, 3V1-03100-2, 3V1-03133-2, 3DN-03100-0, 3DN-03133-0, 3V2-03100-3, and 3FS-03100-0.

Direct replacement design for straightforward, hassle-free installation.
Constructed from a durable metal alloy for longevity in marine environments.
Includes an accelerator pump (on applicable models) to ensure smooth throttle response.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.

Brand	Part Number
Tohatsu	3DP-03100-0
Tohatsu	3DP-03133-0
Tohatsu	3V2-03100-2
Tohatsu	3V2-03133-2
Tohatsu	3V1-03100-2
Tohatsu	3V1-03133-2
Tohatsu	3DN-03100-0
Tohatsu	3DN-03133-0
Tohatsu	3V2-03100-3
Tohatsu	3FS-03100-0

Engine & Model Compatibility

Confirm your engine model and year in the table below to ensure accurate fitment.

For Tohatsu/Nissan owners: This carburetor fits a wide range of 8HP and 9.8HP four-stroke models produced since 2003.

For Mercury/Mariner owners: This part is compatible with 8HP and 9.8HP 4-stroke models that are based on Tohatsu powerheads. Please cross-reference your engine's part number.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Tohatsu	MFS8	8	4-Stroke	2003 and newer	3DP-03100-2	Base model
Tohatsu	NSF8	8	4-Stroke	2003 and newer	3DP-03100-2	Nissan branded version
Tohatsu	MFS9.8	9.8	4-Stroke	2003 and newer	3DP-03100-2	Multiple variants
Tohatsu	MFS9.8A	9.8	4-Stroke	2003 and newer	3DP-03100-2
Tohatsu	MFS9.8A2	9.8	4-Stroke	2003 and newer	3DP-03100-2
Tohatsu	MFS9.8A3	9.8	4-Stroke	2003 and newer	3DP-03100-2
Tohatsu	MFS9.8B	9.8	4-Stroke	2003 and newer	3DP-03100-2

Technical Specs

Product Type: Carburetor Assembly
Installation: Direct replacement
Fuel Type: Gasoline
Connection: Direct mount to intake manifold
Housing Material: Metal (alloy)
Housing Color: Silver
Warranty: 1-year against manufacturing defects
Other Technical Attributes: Includes accelerator pump (on some models)

What’s in the Box

1 x Carburetor Assembly (replaces 3DP-03100-0/3DP-03100-2/3V2-03100-2/3V2-03100-3/3FS-03100-0)

Installation Notes

Ensure the engine is off, cool, and disconnected from the fuel line and spark plug wire(s).
Relieve any fuel system pressure. Take photos of hose and linkage connections for reference.
Remove the airbox or flame arrestor cover to access the carburetor.
Carefully disconnect the fuel lines, throttle linkage, and choke linkage.
Unbolt and remove the old carburetor assembly. Clean any gasket residue from the intake manifold surface.
Install the new carburetor, ensuring the gasket is correctly aligned and seated.
Tighten the mounting bolts evenly and to the manufacturer's recommended torque specification.
Reconnect all fuel lines, along with the throttle and choke linkages.
Reinstall the airbox/flame arrestor assembly.
Reconnect the spark plug wire and prime the fuel system. Carefully check for any fuel leaks before proceeding.
Start the engine. You may need to adjust the idle speed and mixture screws for smooth and stable operation.

Troubleshooting & FAQ

How do I know if this carburetor will fit my engine?

This carburetor is specifically for Tohatsu/Nissan 8HP and 9.8HP 4-stroke outboards (MFS8, NSF8, MFS9.8 series) from 2003 onwards, plus equivalent Mercury/Mariner models using the same Tohatsu powerhead. The best way to confirm is to match your original part number against our Part Number Matrix and verify your model in the compatibility table.

Are adjustments needed after installation?

Yes, final adjustment of the idle speed and air/fuel mixture screws is typically required after installation. This tuning is essential to ensure the engine idles smoothly and performs correctly across the RPM range.

What are the signs of a failing carburetor?

Common symptoms of a faulty carburetor include difficulty starting, rough idling, stalling at low speeds, poor acceleration, hesitation, excessive black smoke from the exhaust, or fuel leaking from the carburetor body. These often point to clogged internal passages, a faulty float, or leaking seals.

How often should I service the carburetor?

Maintenance frequency depends on fuel quality and how often you use the engine. As a general guideline, we recommend cleaning the carburetor annually or whenever performance issues arise. If it is severely clogged, internally corroded, or damaged, replacement is the most effective solution.

Does this include an accelerator pump?

Yes, this carburetor assembly features an integrated accelerator pump. This component provides an extra jet of fuel during sudden throttle openings, which prevents engine hesitation and ensures a smooth power delivery.

Is this an original OEM part?

This is a high-quality aftermarket replacement, not an original equipment manufacturer (OEM) part. It is engineered to meet or exceed OEM-level specifications using comparable materials and is manufactured in an ISO 9002 certified facility with batch inspections to ensure consistency and quality.

What is your shipping speed and cost?

We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free for most orders, and expedited shipping options are available at checkout where applicable.

What is the warranty and return policy?

This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our full policy page or reach out for instructions.

Safety & Important Info

Verify images and specifications against your original part before ordering. If anything differs—even if your model is listed as compatible—do not purchase.
This is an aftermarket replacement part, not an OEM component. Brand names and part numbers are used for reference purposes only.
Professional installation is strongly recommended for safety, performance, and to prevent damage to your engine.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
Fast Global Fulfillment — We offer free standard delivery to most regions, with an average transit time of 5–15 days.
Manufacturer-Direct Value — Our parts deliver fair pricing without ever compromising on materials or quality control.

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