In-line Fuel Filter – Fits Mercury/Mariner 30–200 HP Outboard Engines (Replaces 816296Q03, 816296K2, 35-816296Q03)

In-line Fuel Filter – Fits Mercury/Mariner 30–200 HP Outboard Engines

This in-line fuel filter is designed for a wide range of Mercury and Mariner outboard engines from 30 to 200 HP, primarily 2-stroke models from the 1990s through the early 2000s. It also fits select Johnson/Evinrude outboard engines from 25–225 HP and certain Yamaha F-series 4-stroke models.

This part is a direct replacement for Mercury part numbers 816296Q03, 35-816296Q03, 35-816296K2, Sierra 18-7830, Johnson/Evinrude 398327, and Yamaha 65W-24251-10-00.

• Installation Method: Installs under-cowl, in-line with the fuel hose.
• Fuel Compatibility: Approved for use with gasoline and ethanol-blended fuels (E10).
• Connection Type: Fits 5/16 inch (8mm) fuel lines with a push-on barb connection.

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.

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.

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.

Mercury/Mariner

Johnson/Evinrude

Yamaha

Technical Specifications

Package Contents

• 1 x In-Line Fuel Filter (816296Q03)

Installation Guide

1. Safety First: Ensure the engine is completely off and cool to the touch. Disconnect the battery for safety.
2. Locate Filter: Remove the engine cowl and locate the existing in-line fuel filter.
3. Prepare for Spillage: Place a clean rag or shop towel under the filter to catch any fuel that may spill.
4. Loosen Clamps: Using pliers, loosen the clamps securing the fuel lines to both ends of the old filter.
5. Remove Old Filter: Gently twist and pull the fuel lines off the filter. Be prepared for a small amount of fuel to leak out.
6. Check Fuel Flow Direction: Note the arrow on the new filter. This indicates the direction of fuel flow and must point towards the engine.
7. Install New Filter: Connect the fuel lines to the new filter, ensuring the flow arrow is correctly oriented.
8. Secure Clamps: Slide the clamps back into position on the hose and tighten them securely over the filter's barbed connections.
9. Prime the System: Squeeze the primer bulb until it is firm to fill the new filter with fuel.
10. Final Check: Inspect for any signs of leaks around the connections. Once confirmed there are no leaks, start the engine and check again.

Troubleshooting & FAQ

How do I confirm this fits my engine?
Start by checking the Compatible Engine Models tables on this page. For precise verification, use the linked guides to find your engine's serial number and cross-reference it with the listed ranges. Verifying the part number stamped on your old filter is also a reliable method.

How often should I replace the fuel filter?
For most outboards, the recommended replacement interval is every 100 hours of operation or at least once a year, whichever comes first. Refer to your engine's service manual for the specific maintenance schedule.

What are the signs of a failing or clogged fuel filter?
Common symptoms include the engine sputtering or hesitating, a noticeable loss of power, difficulty starting, or stalling at low speeds. The clear housing on this filter also allows for a visual inspection of trapped 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.