Fuel Pump – Fits Johnson/Evinrude 6HP, 8HP, 9.9HP, 15HP (Replaces 397839, 391638, 395091, 397274)

Fuel Pump – Fits Johnson/Evinrude 6HP, 8HP, 9.9HP, 15HP (Replaces 397839)

This fuel pump assembly is a direct-fit replacement for a wide range of Johnson/Evinrude outboard engines, including popular 4.5 HP to 25 HP models manufactured between 1968 and 1992. It is also cross-compatible with select Mercury applications calling for part number 878965.

Engineered to meet or exceed OEM specifications, this diaphragm-type fuel pump ensures reliable fuel delivery for consistent engine performance. It replaces Johnson/Evinrude part numbers 397839, 391638, 395091, and 397274, as well as several aftermarket equivalents.

• Installation Method: Direct OEM replacement with two barbed hose fittings.
• Included Parts: Comes with a fuel pump and a new gasket (part 0303615).
• Fuel Compatibility: Designed for use with gasoline.

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.

Technical Specifications

Package Contents

• 1 x Fuel pump assembly (397839)
• 1 x Gasket (0303615)
• 2 x Cable ties (included in select aftermarket packages)

Installation Guide

1. Safety First: Before starting, ensure the engine is off and cool. Disconnect the battery terminals to prevent accidental starting. Work in a well-ventilated area.
2. Locate Fuel Pump: Identify the old fuel pump on the engine block. Note the orientation of the fuel inlet and outlet hoses.
3. Disconnect Fuel Lines: Place a rag under the pump to catch any spilled fuel. Carefully loosen the hose clamps and disconnect the fuel lines from the pump.
4. Remove Old Pump: Unscrew the mounting bolts holding the fuel pump to the engine. Remove the pump and the old gasket. Clean the mounting surface on the engine block thoroughly.
5. Install New Pump: Place the new gasket onto the engine block, aligning it with the bolt holes. Mount the new fuel pump, ensuring it is oriented correctly, and tighten the mounting bolts securely.
6. Reconnect Fuel Lines: Attach the inlet and outlet fuel lines to the new pump's barbed fittings and secure them with the hose clamps.
7. Prime and Test: Squeeze the primer bulb until firm to fill the pump with fuel. Reconnect the battery. Start the engine and carefully inspect the pump and connections for any fuel leaks.

Troubleshooting & FAQ

How do I confirm this fits my Johnson/Evinrude engine?
This pump fits a wide range of Johnson/Evinrude models from 1968-1992. The most reliable method is to match your old part number to one of the numbers listed in our Part Number Cross-Reference table (e.g., 397839, 397274). You can also check the Compatible Engine Models table. For further help, use the Johnson/Evinrude Serial Number Guide linked above.

What are the signs of a failing fuel pump?
Common symptoms include difficulty starting the engine, stalling at low speeds, engine sputtering or surging at high speeds, and a noticeable loss of power. A visual inspection may also reveal fuel leaks or cracks on the pump housing.

My Mercury engine uses part 878965. Will this work?
Yes, this pump is a direct cross-reference for Mercury OEM part #878965. However, as specific Mercury model documentation is limited, please visually compare your old pump with our product images to ensure an identical match before ordering.

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.