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Carburetor Assembly – Fits Mercury Marine 9.9-18HP (Replaces 803687A1, 803687T01)

$72.00

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Orders are typically processed within 1–2 business days.


U.S. orders usually arrive within 6–15 days, depending on stock location and destination.


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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 Carburetor Assembly – Fits Mercury Marine 9.9HP, 15HP, 18HP 2-Stroke Outboards is an aftermarket replacement designed for a range of Mercury and Mariner 2-stroke engines. It is engineered for 9.9HP, 15HP, and 18HP models manufactured from the early 2000s to 2006, depending on the specific engine model.

It serves as a direct cross-reference for Mercury OEM part numbers 803687A1, 803687T01, 3303-803687A1, 3303-803687T01, and 8M0065489.

  • Engineered for direct OEM replacement, ensuring straightforward installation.
  • Designed for use in 2-stroke gasoline outboard applications only.
  • Please note: Gasket inclusion varies by seller and is not guaranteed with every purchase.

Part Number Matrix

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

Brand Part Number
Mercury 803687A1
Mercury 803687T01
Mercury 3303-803687A1
Mercury 3303-803687T01
Mercury 8M0065489

Engine & Model Compatibility

Confirm your engine model/year in the table below.

The following table lists known compatible Mercury and Mariner models. While this part is known to fit 9.9HP models, a complete list is not available; please verify your specific part number before ordering.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Mercury 1015203AL 15 2-Stroke 2003 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015203CL 15 2-Stroke 2004 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015203FL 15 2-Stroke 2006 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015203YL 15 2-Stroke 2001 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015213AL 15 2-Stroke 2003 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015213CL 15 2-Stroke 2004 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015213FL 15 2-Stroke 2006 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015213YL 15 2-Stroke 2001 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015223HL 15 2-Stroke 2006 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015312AL 15 2-Stroke 2003 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015312CL 15 2-Stroke 2004 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015312FL 15 2-Stroke 2006 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1015312YL 15 2-Stroke 2001 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1018203AM 18 2-Stroke 2003 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1018203CM 18 2-Stroke 2004 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1018203FM 18 2-Stroke 2006 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 1018203ZM 18 2-Stroke 2002 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 7015203KL 15 2-Stroke 2001 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 7015203RL 15 2-Stroke 2004 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 7015203UL 15 2-Stroke 2006 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 7015213KL 15 2-Stroke 2001 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 7015213RL 15 2-Stroke 2004 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 7015213UL 15 2-Stroke 2006 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 7015312KL 15 2-Stroke 2001 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 7015312ML 15 2-Stroke 2003 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 7015312RL 15 2-Stroke 2004 803687A1/803687T01 Air Silencer and Fuel Lines
Mercury 7015312UL 15 2-Stroke 2006 803687A1/803687T01 Air Silencer and Fuel Lines

Technical Specs

Product Type
Carburetor Assembly
Installation
Direct OEM Replacement
Fuel Type
Gasoline
Connection
Engine-specific mounting
Housing Material
Metal (Cast)
Housing Color
Silver
Warranty
Varies by seller (30 days to 6 months)
Application
2-stroke engines only

What’s in the Box

  • 1 x Carburetor Assembly (replaces 803687A1 / 803687T01)
  • Gaskets (PN 27-803699 / 27-803699001) may be included. Please verify with the specific listing, as this can vary.

Installation Notes

  1. Ensure the engine is off and cool. Shut off the fuel supply and safely disconnect the fuel line from the carburetor.
  2. Disconnect the throttle linkage and any choke connections, noting their original positions for reassembly.
  3. Remove the mounting bolts that secure the old carburetor to the engine block and carefully remove the unit.
  4. Clean the mounting surface on the engine, making sure no old gasket material remains.
  5. Position the new gasket and carburetor assembly onto the mounting studs.
  6. Tighten the mounting bolts evenly and securely, following any torque specifications if available.
  7. Reconnect the fuel line, throttle linkage, and choke connections.
  8. Turn the fuel supply on and prime the system. Check carefully for any fuel leaks before attempting to start the engine.

Troubleshooting & FAQ

How do I confirm this carburetor fits my outboard?

The best way to ensure compatibility is to match your engine's model number and year against our compatibility table. You should also verify by cross-referencing your existing carburetor's part number with those listed in our Part Number Matrix.

What are the signs of a failing carburetor?

Common symptoms include difficulty starting, rough idling, stalling at low speeds, hesitation upon acceleration, poor fuel economy, and black smoke from the exhaust. If your engine shows these signs, a faulty carburetor could be the cause.

Will I need to adjust or "tune" this new carburetor?

Our carburetors are preset at the factory to match OEM specifications and should work out of the box for most applications. However, minor adjustments to the idle or air/fuel mixture screws may be necessary to achieve optimal performance for your specific engine and conditions.

Does this carburetor include gaskets?

Gasket inclusion varies by seller. Some kits include the necessary Gasket Set (PN 27-803699/27-803699001), while others do not. Please check the "What's in the Box" section of the specific listing you are purchasing from to confirm.

What is the difference between part numbers 803687A1 and 803687T01?

In many cases, part numbers ending in T01 supersede older versions like A1. For this carburetor, they are considered functionally identical and fully interchangeable. You can use this replacement for an engine requiring either part number.

Can I use this carburetor on a 4-stroke engine?

No. This carburetor is designed exclusively for the 2-stroke Mercury and Mariner outboard models listed in the compatibility chart. It will not function correctly on a 4-stroke engine and could cause 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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