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Aftermarket Carburetor Assembly for Mercury Marine 9.9–18 HP 2-Stroke Outboards – Replaces 803687A1 and 803687T01

$72.00

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Product Details

This aftermarket carburetor assembly is intended as a replacement for selected Mercury and Mariner 2-stroke gasoline outboards in the 9.9 HP, 15 HP, and 18 HP ranges. Compatibility depends on the exact engine model, year, and existing carburetor reference, so compare all available identification details before ordering.

This replacement is listed for cross-reference with Mercury part numbers 803687A1, 803687T01, 3303-803687A1, 3303-803687T01, and 8M0065489.

  • Aftermarket replacement carburetor assembly for selected Mercury and Mariner outboards.
  • Intended for 2-stroke gasoline applications only.
  • Engine-specific fitment must be confirmed using the model and year of the outboard.
  • Gasket inclusion is not confirmed for every listing; review the package contents before purchase.

Part Number Matrix

Use the following references when comparing the original component with this replacement.

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

Engine & Model Compatibility

The model references below represent the supplied compatibility data for selected Mercury 2-stroke outboards. Match the complete engine model and year to your original part before ordering; a horsepower match alone is not sufficient to establish fitment.

Brand Model Rated HP Stroke Year Reference Application Note
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

Product Type
Aftermarket carburetor assembly
Application
Selected Mercury and Mariner 2-stroke gasoline outboards
Rated Engine Range
9.9 HP, 15 HP, and 18 HP applications as listed
Installation
Replacement installation using engine-specific mounting and connections
Fuel
Gasoline
Stroke
2-stroke only
Reference Numbers
803687A1, 803687T01, 3303-803687A1, 3303-803687T01, and 8M0065489

What's in the Box

  • 1 × Carburetor assembly
  • Gaskets are not confirmed as included with every listing. Gasket references associated with the application include 27-803699 and 27-803699001; verify the actual package contents before purchase.

Installation Notes

  1. Turn the engine off, allow it to cool, shut off the fuel supply, and work in a well-ventilated area away from ignition sources.
  2. Disconnect the fuel line and carefully note the routing of the throttle linkage and choke connections.
  3. Remove the mounting hardware and take off the existing carburetor.
  4. Clean the mounting surface and remove old gasket material without damaging the mating surfaces.
  5. Install the correct gasket if supplied or separately purchased, then position the replacement carburetor.
  6. Tighten the mounting hardware evenly according to the engine manufacturer's service information.
  7. Reconnect the fuel line, throttle linkage, and choke connections in their original positions.
  8. Prime the fuel system, inspect for leaks, and verify throttle and choke operation before starting the engine.

Troubleshooting & FAQ

How do I confirm compatibility?

Match the complete engine model and year, stroke type, and the reference number on your original carburetor with the information above. Do not rely on horsepower alone.

What symptoms can indicate a carburetor problem?

Possible symptoms include hard starting, rough idle, stalling, hesitation during acceleration, poor fuel economy, or abnormal exhaust smoke. These symptoms can also have other causes, so inspect the complete fuel and ignition systems.

Will adjustment be required after installation?

Adjustment or synchronization may be required depending on the engine and the condition of the replacement. Follow the service procedure for your exact outboard and do not change adjustment screws without the appropriate specifications.

Are gaskets included?

Gasket inclusion is not confirmed for every listing. Check the package description for the specific listing before ordering.

What is the difference between 803687A1 and 803687T01?

Both numbers are listed as references for this replacement. Confirm the number against your engine documentation or original carburetor before purchase rather than assuming that every engine using one number has identical fitment.

Can this be used on a 4-stroke engine?

No. This listing is intended for the selected 2-stroke applications shown in the compatibility information and should not be installed on a 4-stroke engine.

Is this an OEM component?

No. This is an aftermarket replacement carburetor assembly, not a Mercury-branded OEM component.

Safety & Important Information

  • Compare the original part, mounting points, linkages, fuel connections, model number, and year before ordering.
  • Use appropriate fire safety precautions when working with gasoline and fuel-system components.
  • Professional installation is recommended when the required service procedure or adjustment specifications are unfamiliar.
  • Do not install this carburetor on an engine outside the listed 2-stroke applications without verified fitment information.

About Sea Sierra

  • Marine Replacement Parts — Replacement components for selected marine repair applications.
  • Fitment-Focused Listings — Compare model, year, stroke, and part-number information before ordering.
  • Customer Support — Contact support with your engine identification details if you need help comparing the listed references.

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