Inline Fuel Filter – Yamaha/Mercury Mariner F15–F40 4-Stroke & Evinrude E-TEC 15–30 HP 2-Stroke

Product Details

This aftermarket inline fuel filter is designed for selected Yamaha and Mercury Mariner F15–F40 four-stroke outboards and Evinrude E-TEC 15–30 HP two-stroke outboards. It installs in the fuel line to help filter contaminants before fuel reaches the engine.

The filter is listed as an aftermarket replacement for Sierra 18-7830 and corresponds to the Yamaha, Mercury/Mariner, and OMC reference numbers shown below. Always compare the reference number and complete engine details before ordering.

• Inline fuel-filter design for outboard fuel systems.
• Listed as a 5/16-inch fuel filter.
• Single replacement filter; no additional fittings, clamps, or hoses are included.
• Aftermarket replacement part; not manufactured by Yamaha, Mercury, Mariner, Evinrude, Johnson, OMC, or Sierra.

Part Number Matrix

These are customer-facing OEM and aftermarket reference numbers associated with this replacement filter. A reference number alone does not replace checking the engine model, year, horsepower, and stroke.

Engine & Model Compatibility

Fitment is limited to the applications listed by the product catalog. Keep the engine brand, model family, horsepower, stroke, and year together when confirming compatibility.

Technical Specs

Product Type

Inline fuel filter

Fuel System Application

Outboard fuel-line service applications listed above

Nominal Filter Size

5/16 inch

Aftermarket Reference

Sierra 18-7830

Installation Position

In-line between the fuel tank and engine, following the fuel-flow direction marked on the filter

Package Type

Single replacement fuel filter

What’s in the Box

• 1 × Inline fuel filter

Fuel hose, clamps, mounting hardware, and other accessories are not included unless separately stated.

Installation Notes

1. Turn the engine off, remove the ignition key, and allow the engine to cool.
2. Work outdoors or in a well-ventilated area away from flames, sparks, and other ignition sources.
3. Follow the engine manufacturer’s service instructions for relieving fuel-system pressure, if applicable.
4. Place an approved catch container and absorbent material beneath the filter before disconnecting the fuel line.
5. Move the hose clamps away from the filter connections and carefully remove the fuel hoses.
6. Note the fuel-flow direction before removing the old filter.
7. Install the replacement filter with fuel flow directed toward the engine.
8. Push the hoses fully onto the barbed connections and secure them with suitable clamps.
9. Prime the fuel system according to the engine manufacturer’s procedure.
10. Inspect all connections for leaks before starting the engine, then check again after startup.

Troubleshooting & FAQ

Safety & Important Information

• Gasoline is flammable. Stop the engine and eliminate ignition sources before servicing the fuel system.
• Use only fuel hose and clamps appropriate for the application.
• Check for leaks before operating the boat.
• Verify the original filter, reference number, engine model, year, horsepower, and stroke before ordering.
• This replacement is intended for the listed outboard applications; compatibility with other engines is not established by a matching number alone.

About Sea Sierra

• Marine Replacement Parts — Practical aftermarket components for routine outboard maintenance and repair.
• Application-Focused Listings — Product information is organized around reference numbers and engine fitment details.
• Service Support — Review the complete application information before installation and contact support if you need help comparing your original part.