Carburetor Assembly – Fits Mercury Marine 9.9HP, 15HP, 18HP 2-Stroke Outboards
This carburetor assembly is a direct-fit replacement for a range of Mercury and Mariner 2-stroke outboard engines, including 9.9HP, 15HP, and 18HP models manufactured from the early 2000s through 2006. It is designed to restore engine performance and fuel efficiency by replacing a worn or faulty original carburetor.
This component is engineered to meet or exceed original equipment specifications, providing a reliable solution for engine maintenance. It directly replaces Mercury part numbers 803687A1, 803687T01, 3303-803687A1, 3303-803687T01, and 8M0065489.
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Installation Type: Direct OEM-style replacement for straightforward installation.
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Engine Compatibility: Designed exclusively for 2-stroke gasoline outboard engines.
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Included Components: The assembly is ready for installation out of the box. Please see the Package Contents section for details on gasket inclusion.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand |
Part Number |
| Mercury |
803687A1 |
| Mercury |
803687T01 |
| Mercury |
3303-803687A1 |
| Mercury |
3303-803687T01 |
| Mercury |
8M0065489 |
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.
| 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 Specifications
| Specification |
Value |
| 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) |
| Other Technical Attributes |
2-stroke applications only |
Package Contents
- 1 x Carburetor Assembly (Replaces 803687A1/803687T01)
- Gaskets (27-803699/27-803699001) - Note: Gasket inclusion varies by seller. Verify contents with your chosen seller before purchasing.
Installation Guide
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Safety First: Ensure the engine is completely cool and disconnect the battery negative terminal.
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Fuel Supply: Shut off the fuel valve. Place a rag or container under the fuel line connection and carefully disconnect it from the carburetor.
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Linkages: Detach the throttle and choke control linkages. Take a photo or note their positions for accurate reassembly.
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Remove Old Carburetor: Unscrew the mounting nuts or bolts that secure the carburetor to the intake manifold and remove the old unit.
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Clean Surface: Thoroughly clean the engine’s intake manifold surface, ensuring all old gasket residue is removed for a proper seal.
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Position Gasket: Place the new gasket onto the manifold, aligning it with the mounting studs.
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Install New Carburetor: Mount the new carburetor assembly onto the studs, ensuring it sits flush against the new gasket.
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Secure Assembly: Hand-tighten the mounting nuts/bolts, then torque them evenly in a crisscross pattern to the manufacturer-specified value. Do not overtighten.
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Reconnect: Reattach the throttle and choke linkages, followed by the fuel line.
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Check for Leaks: Turn the fuel supply on and carefully inspect for any fuel leaks around the connection.
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Final Steps: Reconnect the battery terminal. Start the engine in a well-ventilated area and allow it to warm up.
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Adjust Idle: If necessary, adjust the idle speed screw to achieve a smooth, stable idle per your engine’s service manual.
Troubleshooting & FAQ
Q: How do I confirm this carburetor will fit my specific engine?
A: The most reliable method is to cross-reference your original part number with those listed in the "Part Number Cross-Reference" table. Additionally, check your engine's model and serial number against the "Compatible Engine Models" list. Use the provided Mercury guides to help identify your model if you are unsure.
Q: Does this carburetor assembly include new gaskets?
A: Gasket inclusion varies. While some sellers package this carburetor with the required mounting gaskets (part no. 27-803699/27-803699001), others may not. It is critical to check the contents of the specific listing you are purchasing from.
Q: What are common signs that my original carburetor needs to be replaced?
A: Common symptoms of a failing carburetor include difficulty starting, rough or unstable idling, engine stalling at low speeds, fuel leaking from the carburetor body, and a noticeable decrease in engine performance or fuel economy.
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?
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Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
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Fast Global Shipping: Free delivery worldwide in 5–15 days.
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Direct from Manufacturer: Competitive pricing without compromising quality.