3/8" Inline Fuel Filter – Fits Johnson/Evinrude & Mercury (Replaces 398319, 802128A1)

3/8" Inline Fuel Filter – Fits Johnson/Evinrude & Mercury (Replaces 398319, 802128A1)

This inline fuel filter is designed for a wide range of Johnson/Evinrude outboard engines from 4 to 250 HP (1988–2004) and is also compatible with various Mercury and Mariner outboard models from a similar era. Its universal design ensures broad applicability for maintaining a clean fuel supply.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring you can find the right match for your engine maintenance needs.

• Filtration: Protects your engine with a 10-micron filtration rating, suitable for gasoline and ethanol-blend fuels.
• Installation: Features universal inline installation with 3/8" (9.5mm) barbed hose connections for a secure fit.
• Construction: Built with a clear, translucent plastic housing and sonically sealed metal end caps for durability and easy inspection.

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 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.

Johnson/Evinrude

Mercury/Mariner

Technical Specifications

Package Contents

• 1 x Inline Fuel Filter (Replaces Sierra 18-7831, Johnson/Evinrude 398319, Mercury 802128A1)

Installation Guide

1. Shut off the fuel supply and work in a well-ventilated area away from sparks or open flames.
2. Place a rag or container under the old filter to catch any spilled fuel.
3. Note the direction of fuel flow, usually indicated by an arrow on the old filter body.
4. Loosen the clamps on the fuel hoses connected to the old filter and carefully twist to remove the hoses.
5. Install the new filter, ensuring the arrow points in the correct direction of fuel flow (towards the engine).
6. Securely attach the fuel hoses to the new filter and tighten the clamps. Do not overtighten.
7. Prime the fuel system according to your engine's service manual to fill the new filter with fuel.
8. Once primed, inspect the filter and all connections carefully for any signs of leaks before starting the engine.

Troubleshooting & FAQ

How do I confirm this fits my engine?

This filter fits a wide range of Johnson/Evinrude (4-250 HP, 1988-2004) and Mercury outboards. To ensure compatibility, cross-reference your existing part number with those listed in our cross-reference table, such as Johnson/Evinrude 398319, Mercury 802128A1, or Sierra 18-7831.

How often should I replace the fuel filter?

For optimal engine performance and protection, we recommend replacing the fuel filter after every 50 hours of operation or at least once per year during your annual service.

What are the signs of a clogged fuel filter?

Common symptoms of a failing filter include the engine hesitating, sputtering, stalling at low speeds, or failing to start. A noticeable drop in maximum engine RPM can also indicate a fuel restriction issue that a new filter may resolve.

Is this filter compatible with ethanol-blended fuels?

Yes, this filter is approved for use with modern gasoline, including ethanol blends like E10.

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.