Fuel Pump Assembly – Fits Johnson/Evinrude 6-25 HP (Replaces 397839, 388681, 386978)

Fuel Pump Assembly – Fits Johnson/Evinrude 6-25 HP (Replaces 397839, 388681, 386978)

This fuel pump assembly is designed for Johnson/Evinrude 6–25 HP 2-stroke outboard motors manufactured between 1981 and 1998. It serves as a direct-fit replacement, restoring reliable fuel delivery and engine performance.

Engineered to meet or exceed OEM specifications, this pulse-driven diaphragm pump ensures consistent fuel flow for optimal operation. It replaces a wide range of original and aftermarket part numbers, offering broad compatibility for various models within the specified horsepower range.

• Installation Method: Mounts via direct bolt-on with included straps.
• Included Components: The kit contains the fuel pump, mounting straps, and a gasket.
• 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.

Technical Specifications

Package Contents

• 1 x Fuel Pump (Replaces OEM 397839)
• 2 x Straps/Bands (Replaces OEM 320107)
• 1 x Fuel Pump Gasket (Replaces OEM 303615)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is cool. Work in a well-ventilated area away from sparks or flames.
2. Relieve Fuel Pressure: Carefully follow your engine's service manual to safely relieve pressure from the fuel system.
3. Disconnect Lines: Place a rag under the fuel pump to catch any spills. Disconnect the inlet and outlet fuel lines from the pump. Note their orientation.
4. Remove Old Pump: Unbolt and remove the old fuel pump from the engine block. Also, remove the old gasket material and clean the mounting surface thoroughly.
5. Install Gasket: Place the new gasket included in the kit onto the engine block, aligning it with the mounting holes.
6. Mount New Pump: Position the new fuel pump over the gasket and secure it with the original mounting bolts. Tighten to the manufacturer's recommended torque.
7. Reconnect Lines: Re-attach the fuel lines to the correct fittings on the new pump and secure them with clamps.
8. Final Checks: Reconnect the battery. Prime the fuel system according to your engine's procedure and carefully inspect all connections for leaks before starting the engine.

Troubleshooting & FAQ

How do I confirm this part fits my engine?
Start by checking our Part Number Cross-Reference table to see if your old part number is listed. Next, review the Compatible Engine Models table to ensure your specific engine model, horsepower, and year range are included. Always compare the product images to your old part before ordering.

What are the common signs of a failing fuel pump?
Symptoms of a bad fuel pump include the engine failing to start, sputtering at high speeds, losing power under load, or experiencing sudden surges in speed. These issues often indicate inconsistent fuel pressure.

Is a new gasket included with this pump?
Yes, this kit includes a new fuel pump gasket (303615) and mounting straps. It is critical to use the new gasket to ensure a proper seal against the engine block.

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.