35-8M0134466 Fuel Filter for Mercury 9.9HP EFI 10HP EFI 15HP EFI 15HP EFI Sea Pro 20HP EFI | JLM Marine

35-8M0134466 Fuel Filter for Mercury 9.9HP EFI 10HP EFI 15HP EFI 15HP EFI Sea Pro 20HP EFI

This fuel filter is designed for Mercury EFI outboard engines ranging from 9.9HP to 20HP. Engineered to meet the demanding requirements of Electronic Fuel Injection systems, it ensures clean fuel delivery and optimal engine performance across Mercury's modern outboard lineup.

This filter directly replaces Mercury OEM part numbers 35-8M0134466 and 8M0134466, providing a reliable aftermarket solution for maintaining your engine's fuel system.

• Essential maintenance component for Mercury EFI outboards
• Compatible with 9.9HP, 10HP, 15HP, 15HP Sea Pro, and 20HP EFI models
• Direct-fit replacement for hassle-free installation

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 × Fuel Filter (35-8M0134466)

Installation Guide

1. Disconnect the fuel line from your outboard engine and relieve any residual fuel pressure in the system. Ensure the engine is off and cool before beginning work.
2. Locate the existing fuel filter on your Mercury EFI outboard. It is typically positioned along the fuel line between the fuel tank and the engine.
3. Using pliers or a wrench, carefully disconnect the fuel line fittings from both sides of the old filter. Have a rag or container ready to catch any fuel spillage.
4. Remove the old fuel filter from the fuel line. Note the direction of fuel flow indicated by the arrow on the filter housing.
5. Install the new fuel filter, ensuring the arrow on the housing points in the direction of fuel flow (toward the engine). Proper orientation is critical for correct operation.
6. Securely attach the fuel line fittings to both ends of the new filter. Tighten connections to manufacturer specifications to prevent leaks.
7. Reconnect the fuel line to the engine. Double-check all connections for tightness.
8. Prime the fuel system by squeezing the primer bulb until it becomes firm. This removes air from the fuel line.
9. Start the engine and inspect all connections for fuel leaks. Allow the engine to run for a few minutes to ensure proper fuel delivery.
10. If any leaks are detected, shut off the engine immediately and retighten the affected connections.

Troubleshooting & FAQ

Q: How do I confirm this fuel filter fits my Mercury outboard?
A: Check your engine's serial number against the compatibility table above. This filter fits Mercury 9.9HP, 10HP, 15HP, 15HP Sea Pro, and 20HP EFI models with serial numbers 0R833820 & up (1R008146 & up for 9.9HP). You can also verify using the Mercury Serial Number Guide.

Q: How often should I replace the fuel filter on my EFI outboard?
A: Mercury recommends replacing the fuel filter annually or every 100 hours of operation, whichever comes first. If you use ethanol-blended fuels or operate in harsh conditions, consider more frequent replacement to prevent fuel system issues.

Q: What are the signs that my fuel filter needs replacement?
A: Common symptoms include difficulty starting, rough idling, loss of power at higher RPMs, engine sputtering or stalling, and reduced fuel efficiency. A clogged filter restricts fuel flow and starves the EFI system.

Q: Can I install this filter in either direction?
A: No, fuel filters must be installed with the arrow on the housing pointing toward the engine (direction of fuel flow). Incorrect installation can cause fuel delivery problems and potential engine damage.

Q: Is this an OEM Mercury part or an aftermarket replacement?
A: This listing is an aftermarket replacement part. 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.