Fuel Pump Replacement for Select Johnson/Evinrude 4.5–25 HP Applications – Cross-References 397839, 391638, 395091, 397274 and Mercury 878965
Fuel Pump Replacement for Select Johnson/Evinrude 4.5–25 HP Applications – Cross-References 397839, 391638, 395091, 397274 and Mercury 878965 is backordered and will ship as soon as it is back in stock.
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Fuel Pump Replacement for Select Johnson/Evinrude 4.5–25 HP Applica...
Fuel Pump Replacement for Select Johnson/Evinrude 4.5–25 HP Applications – Cross-References 397839, 391638, 395091, 397274 and Mercury 878965 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket outboard engine fuel pump is intended as a replacement for select Johnson/Evinrude applications, including listed 4.5 HP, 6 HP, 8 HP, 9.9 HP, 15 HP, 20 HP and 25 HP models. Fitment depends on the exact engine model, year, stroke configuration and original pump, so compare the applicable part number and pump design before ordering.
The pump is listed as a replacement or cross-reference for Johnson/Evinrude numbers 397839, 391638, 395091 and 397274, as well as Mercury 878965. Additional aftermarket references include Sierra 18-7350, Mallory 9-35350, EMP 1399-07350, Redline RL7350 and Quicksilver 8M6010285. These references should be used together with a visual and application check; a number match alone does not confirm every engine configuration.
- Replacement fuel pump for selected outboard applications.
- Diaphragm-type pump design with barbed fuel-hose connections.
- Designed for replacement installation where the original pump, mounting pattern and hose connections match.
- Aftermarket component; not sold as a genuine OEM part.
Part Number Matrix
Use the following references to compare your existing fuel pump and engine documentation before purchase.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 397839 |
| Johnson/Evinrude | 391638 |
| Johnson/Evinrude | 395091 |
| Johnson/Evinrude | 397274 |
| Mercury | 878965 |
| Sierra | 18-7350 |
| Mallory | 9-35350 |
| EMP | 1399-07350 |
| Redline | RL7350 |
| Quicksilver | 8M6010285 |
Engine and Model Compatibility
Application information for this replacement pump is broad and may vary by exact model and production year. Keep the horsepower, year, stroke and model conditions together when checking fitment.
Johnson/Evinrude: The listed application range includes selected 4.5 HP, 6 HP, 8 HP, 9.9 HP, 15 HP, 20 HP and 25 HP outboards, with commonly cited model years from 1968 through 1992. The 20 HP and 25 HP applications should be treated as model-specific and verified against the original pump and engine parts information.
Mercury: The pump is cross-referenced to Mercury part number 878965, but a complete Mercury model list is not established here. Verify the exact Mercury model, year, mounting arrangement, hose connections and original part number before ordering.
| Brand | Model | Rated HP | Stroke | Years | Reference Part No. | Fitment Note |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 4.5 | Verify exact configuration | Commonly listed as 1968–1992 | 397839 | Confirm model and original pump. |
| Johnson/Evinrude | Various | 6 | Verify exact configuration | Commonly listed as 1968–1992 | 397839 | Confirm model and original pump. |
| Johnson/Evinrude | Various | 8 | Verify exact configuration | Commonly listed as 1968–1992 | 397839 | Confirm model and original pump. |
| Johnson/Evinrude | Various | 9.9 | Verify exact configuration | Commonly listed as 1968–1992 | 397839 | Confirm model and original pump. |
| Johnson/Evinrude | Various | 15 | Verify exact configuration | Commonly listed as 1968–1992 | 397839 | Confirm model and original pump. |
| Johnson/Evinrude | Various | 20 | Verify exact configuration | Application-specific | 397839 | Reported in some application listings; verify carefully. |
| Johnson/Evinrude | Various | 25 | Verify exact configuration | Application-specific | 397839 | Reported in some application listings; verify carefully. |
| Mercury | Various | Not specified | Not specified | Not specified | 878965 | Cross-reference only; confirm the exact Mercury application. |
Technical Specifications
- Product Type
- Outboard engine fuel pump
- Installation
- Replacement installation for matching applications
- Fuel Type
- Gasoline
- Pump Design
- Diaphragm-type fuel pump
- Connection
- Two barbed fuel-hose fittings
- Housing Construction
- Metal base with plastic or composite upper section
- Housing Appearance
- Black with metal-colored accents
- Approximate Weight
- 0.25 kg (0.55 lb), where applicable
- Fitment Requirement
- Original pump number, mounting holes, hose routing and pump configuration must match.
What's in the Box
- 1 x Fuel pump assembly
- 1 x Mounting gasket, where included with the applicable package
- 2 x Cable ties, only where included in the applicable aftermarket package
Package contents can vary by supplier or package configuration. Confirm the supplied contents before installation, and do not assume that optional accessories are included unless shown or stated with the order.
Installation Notes
- Disconnect the battery and observe all fuel-system safety precautions before beginning work.
- Label the inlet and outlet fuel lines, then disconnect them from the old pump.
- Remove the fasteners and take the old fuel pump off the engine block.
- Clean the mounting surface and remove old gasket material without damaging the sealing surface.
- Install the correct new gasket if one is supplied or specified for the application.
- Position the replacement pump with the correct orientation and align the mounting holes.
- Tighten the mounting fasteners to the engine manufacturer's specified torque.
- Reconnect the fuel lines to the correct inlet and outlet fittings and secure them properly.
- Reconnect the battery, prime the fuel system according to the service manual and inspect for leaks before starting the engine.
Always follow the engine manufacturer's service information. If the mounting pattern, hose routing or pump orientation differs from the original, stop and verify compatibility before installation.
Troubleshooting and FAQ
How do I confirm that this fuel pump fits my engine?
Compare the original pump's manufacturer number with the reference list, then verify the exact engine brand, model, year, horsepower, stroke configuration, mounting pattern, hose connections and pump orientation. For Mercury applications, the 878965 cross-reference should not be treated as a complete model list.
What are common signs of a failing fuel pump?
Possible symptoms include hard starting, sputtering, stalling, loss of power, inconsistent operation at higher speed and poor fuel delivery. These symptoms can also be caused by blocked filters, damaged fuel lines, carburetor problems or other fuel-system faults, so diagnose the complete system before replacing the pump.
How often should the pump be replaced?
There is no universal replacement interval for this type of pump. Inspect it when fuel delivery problems occur, during fuel-system service or when the pump, gasket or connected hoses show signs of damage, leakage or deterioration.
Is a gasket included?
A gasket may be included with the applicable package, but package contents can vary. Confirm the product package before installation and use the correct gasket for the engine application.
Is this an OEM part?
No. This listing describes an aftermarket replacement fuel pump. The manufacturer and aftermarket reference numbers are provided for comparison and application research; they do not change the component's aftermarket status.
What should I do if the pump does not match my old part?
Do not force the installation or modify the pump, gasket or fuel lines. Recheck the engine model and original part number, and contact support before installation if the mounting pattern, connections or orientation differ.
Safety and Important Information
- Work in a well-ventilated area away from open flames, sparks and ignition sources.
- Relieve fuel-system pressure where applicable and prevent spilled fuel from contacting hot engine surfaces.
- Verify the images, dimensions, connections and reference numbers against the original pump before ordering.
- Do not rely on horsepower alone to establish fitment; exact model, year, stroke and serial or production conditions may apply.
- This is an aftermarket replacement, not a genuine OEM component.
- Professional installation is recommended when the correct application or fuel-system procedure is uncertain.
About Sea Sierra
- Marine Replacement Parts — We offer replacement components for a range of marine repair applications.
- Application-Focused Support — Compare original part numbers and engine details before ordering.
- Value-Oriented Selection — Aftermarket alternatives are presented with applicable reference information to support informed purchasing.
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