Carburetor Assembly – Fits Mercury Marine 9.9HP, 15HP, 18HP 2-Stroke Outboards (Replaces 803687A1, 803687T01)

Carburetor Assembly – Fits Mercury Marine 9.9HP, 15HP, 18HP 2-Stroke Outboards (Replaces 803687A1, 803687T01)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

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.

• Installation Type: Direct OEM-style replacement for straightforward installation.
• Engine Compatibility: Designed exclusively for 2-stroke gasoline outboard engines.
• 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.

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.

Technical Specifications

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

1. Safety First: Ensure the engine is completely cool and disconnect the battery negative terminal.
2. Fuel Supply: Shut off the fuel valve. Place a rag or container under the fuel line connection and carefully disconnect it from the carburetor.
3. Linkages: Detach the throttle and choke control linkages. Take a photo or note their positions for accurate reassembly.
4. Remove Old Carburetor: Unscrew the mounting nuts or bolts that secure the carburetor to the intake manifold and remove the old unit.
5. Clean Surface: Thoroughly clean the engine’s intake manifold surface, ensuring all old gasket residue is removed for a proper seal.
6. Position Gasket: Place the new gasket onto the manifold, aligning it with the mounting studs.
7. Install New Carburetor: Mount the new carburetor assembly onto the studs, ensuring it sits flush against the new gasket.
8. Secure Assembly: Hand-tighten the mounting nuts/bolts, then torque them evenly in a crisscross pattern to the manufacturer-specified value. Do not overtighten.
9. Reconnect: Reattach the throttle and choke linkages, followed by the fuel line.
10. Check for Leaks: Turn the fuel supply on and carefully inspect for any fuel leaks around the connection.
11. Final Steps: Reconnect the battery terminal. Start the engine in a well-ventilated area and allow it to warm up.
12. 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?

• 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.