3/8" Inline Fuel Filter – Fits Johnson/Evinrude, Mercury & Yamaha 398319 GP1-U775C-10-00

3/8" Inline Fuel Filter – Fits Johnson/Evinrude, Mercury & Yamaha

This universal 3/8" inline fuel filter is designed for a wide range of marine engines, serving as a direct replacement for various OEM fuel filters in Johnson/Evinrude, Mercury/Mariner, and Yamaha outboard engines. It is engineered to protect your fuel system from contaminants, ensuring reliable engine performance.

This filter fits various outboard engines that use a 3/8" (10mm) inside diameter fuel line. It serves as a direct replacement for Johnson/Evinrude 398319, Mercury 802128A1, and Yamaha GP1-U775C-10-00, among others.

• Package Includes: 1x Inline Fuel Filters
• Fuel Compatibility: Approved for use with gasoline, including ethanol-blended fuels.
• Installation: Designed for in-line installation with 3/8" fuel hoses.

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 Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

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.

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.

Technical Specifications

Package Contents

• 1x Inline Fuel Filter (Replaces 398319 / 802128A1 / GP1-U775C-10-00)

Installation Guide

1. Turn Off Fuel: Shut off the fuel valve and detach the kill switch lanyard for safety.
2. Prepare for Spillage: Place a rag or suitable container under the existing fuel filter to catch any gasoline.
3. Note Flow Direction: Observe the arrow on the old filter indicating the direction of fuel flow toward the engine.
4. Remove Old Filter: Carefully loosen the hose clamps and twist the fuel hoses off both ends of the old filter.
5. Install New Filter: Position the new filter so the arrow points in the correct direction of fuel flow.
6. Secure Hoses: Slide the fuel hoses firmly onto the new filter's barbed fittings and tighten the clamps securely. Do not overtighten.
7. Check for Leaks: Prime the fuel system by squeezing the primer bulb until firm. Visually inspect the filter and connections for any leaks before starting the engine.

Troubleshooting & FAQ

How do I know if this filter fits my engine?
This filter is a universal replacement for many Johnson/Evinrude, Mercury, and Yamaha outboards that use a 3/8" (10mm) fuel line. To ensure compatibility, check the Part Number Cross-Reference table to see if your old part number is listed. Physically verifying against your engine's original part is the best way to guarantee a match.

How often should I replace my inline fuel filter?
We recommend replacing your fuel filter annually or every 100 hours of operation, whichever comes first. More frequent changes may be necessary if you notice fuel contamination or operate in harsh marine environments.

What are the signs of a failing fuel filter?
Common symptoms include engine hesitation, loss of power, difficulty starting, or stalling, especially under load. A visual inspection of the clear housing may also show water or debris.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.