Inline Fuel Filter – Fits Yamaha 4-9.9 HP Outboards (Replaces 646-24251-01-00, 646-24251-02-00)

Inline Fuel Filter – Fits Yamaha 4-9.9 HP Outboards (Replaces 646-24251-01-00, 646-24251-02-00)

This inline fuel filter fits a range of Yamaha 4-9.9 HP 2-Stroke (1989-2002) and specific 4-Stroke models, including the F4A, F8A, F8B, and F9.9A/FT9.9A series. It is also used for the remote oil tanks on all Yamaha 2-Stroke and HPDI models. Additionally, this filter is compatible with Mercury 9.9 HP 2-Stroke outboards (1995-1998).

It serves as a direct replacement for multiple OEM and aftermarket parts, ensuring broad compatibility for routine maintenance and repairs.

• Fuel Type: Compatible with gasoline and ethanol-blended fuels.
• Simple Installation: Designed for inline installation under the engine cowl.
• Visual Inspection: Features a translucent housing to easily monitor fuel flow and debris.

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.

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 Inline Fuel Filter (Replaces 646-24251-01-00/646-24251-02-00)

Explosion Diagram

Installation Guide

1. Safety First: Shut off the fuel supply at the tank and disconnect the battery.
2. Locate Filter: Find the existing fuel filter, which is typically under the engine cowl in the main fuel line.
3. Note Flow Direction: Look for an arrow on the old filter indicating the direction of fuel flow. It must point toward the engine.
4. Prepare for Removal: Place a rag or towel under the filter to catch any fuel that may spill.
5. Remove Old Filter: Using pliers, carefully loosen and slide the hose clamps off both ends of the filter. Gently twist and pull the fuel lines off the filter.
6. Install New Filter: Attach the fuel lines to the new filter, ensuring the arrow on the new filter points in the correct direction (toward the fuel pump).
7. Secure Connections: Slide the hose clamps back into position over the hose barbs to secure the lines.
8. Final Check: Prime the fuel system using the primer bulb until firm. Check thoroughly for any leaks around the filter and connections before starting the engine.

Troubleshooting & FAQ

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

A: First, review the "Compatible Engine Models" table to see if your model and year range are listed. Then, cross-reference your existing part number with our "Part Number Cross-Reference" table. For added confidence, use the serial number guides for Yamaha and Mercury linked above to pinpoint your exact engine details.

Q: What are the symptoms of a clogged or failing fuel filter?

A: Common signs include difficulty starting, engine sputtering or stalling at low speeds, rough idling, hesitation during acceleration, and an overall loss of engine power. The translucent housing on this filter allows for a quick visual check for water or debris.

Q: How often should I replace my outboard's fuel filter?

A: For preventative maintenance, it is best practice to replace the fuel filter annually or every 100 hours of use, whichever comes first. Refer to your engine’s service manual for the manufacturer-recommended interval.

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.