Fuel Pump Assembly – Fits Yamaha 9.9–15 HP & Mercury 8–15 HP 4-Stroke (Replaces 66M-24410-11-00)

Fuel Pump Assembly – Fits Yamaha 9.9–15 HP & Mercury 8–15 HP 4-Stroke (Replaces 66M-24410-11-00)

This fuel pump assembly is designed for Yamaha 9.9–15 HP 4-stroke outboard motors (1998–2006) and Mercury/Mariner 8–15 HP 4-stroke outboards from similar years. This component ensures reliable fuel delivery for optimal engine performance.

This part is a direct replacement for Yamaha part numbers 66M-24410-00-00, 66M-24410-01-00, 66M-24410-10-00, 66M-24410-11-00 and Mercury part numbers 835389T1, 835389T02, 835389A2. It also replaces Sierra 18-35302 and Mallory 9-35302.

• Installation Method: Direct OEM-style replacement with two hose barb fittings.
• Included Parts: Comes complete with one fuel pump, one hose clamp, and one O-ring for a full installation.
• Compatible Fuel Type: Designed for use with Gasoline.

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 Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

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 Fuel Pump Assembly (66M-24410-11-00)
• 1 x Hose Clamp (90467-09M09-00)
• 1 x O-Ring (93210-20M65-00, 2.65*20mm)

Installation Guide

1. Safety First: Disconnect the battery and work in a well-ventilated area to prevent accidents.
2. Locate Pump: Identify the existing fuel pump on the engine block.
3. Prepare for Removal: Place a rag or container below the pump to catch any fuel spillage.
4. Disconnect Lines: Carefully unclamp and disconnect the inlet and outlet fuel hoses, noting their orientation.
5. Remove Old Pump: Unbolt the old fuel pump assembly and remove it from the engine.
6. Clean Surface: Thoroughly clean the mounting surface to ensure a proper seal.
7. Verify Fitment: Compare the new pump with the old one to confirm it is an exact match.
8. Install New Pump: Position the new pump and any included O-rings or gaskets correctly on the mounting surface.
9. Secure Bolts: Hand-tighten the mounting bolts, then torque them to the manufacturer's specification.
10. Reconnect Lines: Attach the fuel hoses to the correct fittings on the new pump and secure them with clamps.
11. Final Checks: Reconnect the battery. Prime the fuel system and inspect carefully for any leaks before starting the engine.

Troubleshooting & FAQ

Q: How do I confirm this pump fits my specific engine model?

A: First, check if your original part number is listed in our Part Number Cross-Reference table. Next, carefully compare your engine's model, horsepower, and year range against the compatible models listed above. For additional verification, we recommend using the Yamaha or Mercury serial number guides linked in the compatibility section.

Q: What are the common signs of a failing fuel pump?

A: Typical symptoms include the engine having trouble starting, sputtering or stalling, losing power under acceleration, or running rough. You might also notice fuel leakage from the pump body itself. A noticeable decrease in top speed or hesitation can also indicate poor fuel delivery.

Q: Is this a direct replacement for my OEM pump?

A: Yes, this is an aftermarket fuel pump engineered as a direct replacement. It is designed to match the fit, form, and function of the original OEM parts (like Yamaha 66M-24410-11-00) for a straightforward, bolt-on installation.

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.