Fuel Pump – Fits Johnson/Evinrude 4.5–25 HP (Replaces 397839)

$31.20

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Fuel Pump – Fits Johnson/Evinrude 4.5–25 HP (Replaces 397839) is backordered and will ship as soon as it is back in stock.

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Product Details

This aftermarket Fuel Pump – Fits Johnson/Evinrude 4.5–25 HP is designed for 2-stroke and 4-stroke outboard motors manufactured between 1968 and 1992. It also serves as a replacement for Mercury OEM part #878965 in select applications, though specific models are not fully documented.

This component provides a direct interchange for numerous part numbers, including Johnson/Evinrude 397839, 397274, 395091, 391638, Sierra 18-7350, and Mallory 9-35350.

Designed for a direct OEM-level fit and installation.
Manufactured in an ISO 9002 certified facility for quality assurance.
Includes fuel pump, gasket, and cable ties for a complete installation.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Johnson/Evinrude	397839
Johnson/Evinrude	397274
Johnson/Evinrude	395091
Johnson/Evinrude	391638
Johnson/Evinrude	382875
Johnson/Evinrude	386834
Johnson/Evinrude	394789
Johnson/Evinrude	395090
Johnson/Evinrude	388685
Johnson/Evinrude	777750
Johnson/Evinrude	777754
Sierra	18-7350
Mallory	9-35350

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Johnson/Evinrude Owners: This pump is documented to fit a wide range of 2-stroke and 4-stroke outboards from 4.5 HP to 25 HP made between 1968 and 1992.

For Mercury Owners: This part cross-references to OEM #878965. Compatibility with specific Mercury models is not fully documented; please verify fitment independently.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Johnson/Evinrude	Various	4.5	2-Stroke & 4-Stroke	1968–1992	397839
Johnson/Evinrude	Various	6	2-Stroke & 4-Stroke	1968–1992	397839
Johnson/Evinrude	Various	8	2-Stroke & 4-Stroke	1968–1992	397839
Johnson/Evinrude	Various	9.9	2-Stroke & 4-Stroke	1968–1992	397839
Johnson/Evinrude	Various	15	2-Stroke & 4-Stroke	1968–1992	397839
Johnson/Evinrude	Various	20	2-Stroke & 4-Stroke	1968–1992	397839	Compatibility mentioned in some sources
Johnson/Evinrude	Various	25	2-Stroke & 4-Stroke	1968–1992	397839	Compatibility mentioned in some sources
Mercury	Various				878965	Specific models not documented

Technical Specs

Product Type: Outboard Engine Fuel Pump
Installation: Direct OEM replacement
Fuel Type: Gasoline
Housing Color: Black
Weight: 1.28 kg (2.8 lbs)
Warranty: Varies by manufacturer (JLM Marine: manufacturer warranty)
Other Technical Attributes: Produced in ISO9002 certified factory (JLM Marine)

What’s in the Box

1 x Fuel pump assembly (397839)
1 x Gasket (0303615)
2 x Cable ties

Installation Notes

Disconnect the battery and ensure the engine is cool to the touch.
Relieve any pressure in the fuel system by following the manufacturer's service manual procedures.
Carefully disconnect the fuel lines from the old pump, noting their positions. Use a rag to catch any residual fuel.
Remove the mounting bolts securing the old fuel pump and gasket.
Clean the mounting surface on the engine block, ensuring it is free of old gasket material and debris.
Install the new gasket and fuel pump, then tighten the mounting bolts to the manufacturer's specified torque.
Reconnect the fuel lines to the correct fittings on the new pump.
Reconnect the battery, prime the fuel system, and check for leaks before starting the engine.

Troubleshooting & FAQ

How do I confirm this fuel pump fits my engine?

First, check the Engine & Model Compatibility table on this page. This pump fits a wide range of Johnson/Evinrude outboards from 4.5 to 25 HP (1968–1992). For Mercury engines, it cross-references to OEM #878965, but you must verify your specific model. Always compare the photos and part numbers listed with your original part before ordering.

What are the signs of a failing outboard fuel pump?

Common symptoms include the engine failing to start, bogging down at high speeds, stalling, or surging. You might also notice the primer bulb not staying firm, which can indicate a leak in the pump's diaphragm.

Is a gasket included with the pump?

Yes, a new mounting gasket (part #0303615) is included in the package, along with the fuel pump assembly and two cable ties.

How often should an outboard fuel pump be replaced?

There is no fixed replacement interval; it should be replaced when it fails or shows signs of wear. Age, fuel quality (especially with ethanol blends), and operating hours are the primary factors that affect its lifespan. Regular inspection is recommended.

Is this an OEM part?

This listing is an aftermarket replacement, not an original equipment manufacturer (OEM) part. It is built to meet or exceed OEM-level specifications using comparable materials and is manufactured in an ISO 9002 certified facility with batch inspections for quality control.

How fast is shipping?

We ship worldwide, with typical transit times of 5–15 days for standard delivery. Standard shipping is free to most locations, and expedited options may be available at checkout.

What is the warranty and return policy?

This product is covered by a 1-year warranty against manufacturing defects under normal operating conditions. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original packaging. Refer to our policy page or contact us for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

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