3/8" Inline Fuel Filter – Fits Johnson/Evinrude, Mercury & Yamaha (Replaces 398319, 802128A1, GP1-U775C-10-00)
3/8" Inline Fuel Filter – Fits Johnson/Evinrude, Mercury & Yamaha (Replaces 398319, 802128A1, GP1-U775C-10-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
3/8" Inline Fuel Filter – Fits Johnson/Evinrude, Mercury &...
Product Details
This universal 3/8" inline fuel filter is designed for a wide range of marine engines, serving as a direct replacement for various OEM fuel filters in Johnson/Evinrude, Mercury/Mariner, and Yamaha outboard motors. Its clear housing allows for visual inspection of fuel flow and debris.
It provides an interchangeable fit for Johnson/Evinrude 398319, Mercury 802128A1, Yamaha GP1-U775C-10-00, Sierra 18-7831, GLM 40160, and Mallory 9-37960.
- Installs in-line with a 3/8" (10mm) inside diameter fuel hose.
- Sonically sealed caps prevent leaks and are approved for ethanol-based fuels.
- This package includes two filters for a complete replacement or to keep a spare on hand.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Johnson/Evinrude | 398319 / 360941 / 435918 / 765595 | Also listed as 0398319. Other numbers are superseded. |
| Mercury / Mariner | 802128A1 / 802128 | For 3/8" fuel line applications. |
| Yamaha | GP1-U775C-10-00 | For 3/8" fuel line applications. |
| Sierra | 18-7831 | Aftermarket cross-reference. |
| GLM | 40160 | Aftermarket cross-reference. |
| Mallory | 9-37960 | Aftermarket cross-reference. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Johnson/Evinrude: Compatible with various 2-stroke outboards from 25 to 140 HP that use the specified OEM part numbers.
Mercury/Mariner: Fits outboard engines that require a 3/8" inline fuel filter with part number 802128A1 or 802128.
Yamaha: Fits outboard engines requiring the GP1-U775C-10-00 filter, typically used in 3/8" fuel line setups.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 25-140 | 2-Stroke | 398319 | Also listed as 0398319 |
| Johnson/Evinrude | Various | 360941/435918/765595/777715 | Superseded part numbers | ||
| Mercury | Various | 802128A1/802128 | For 3/8" fuel line applications | ||
| Yamaha | Various | GP1-U775C-10-00 | For 3/8" fuel line applications |
Technical Specs
- Product Type
- Inline Fuel Filter
- Installation
- In-line
- Fuel Type
- Gasoline (including ethanol blends)
- Connection
- 3/8" (10mm) inside diameter fuel hose
- Housing Material
- Plastic with metal/plastic internal components
- Housing Color
- Clear/Translucent
- Fitting Type
- Barbed hose ends
- Thread Size
- N/A - Barbed fittings
- Warranty
- 1 Year (North Boatparts)
- Other Technical Attributes
- Sonically sealed end caps; approved for ethanol-based fuels
What’s in the Box
- 2 x Inline Fuel Filter (Replaces 398319, 802128A1, GP1-U775C-10-00)
Installation Notes
- Ensure the engine is off and cool. Relieve any pressure in the fuel system according to your service manual.
- Locate the existing inline fuel filter. Place a rag or container underneath to catch any spilled fuel.
- Loosen the clamps on both ends of the old filter and gently twist to remove the fuel lines.
- Note the fuel flow direction arrow on the old filter. The new filter must be installed in the same orientation.
- Attach the fuel lines to the new filter, ensuring the flow arrow points towards the engine.
- Secure the connections by tightening the hose clamps. Do not overtighten.
- Prime the fuel system as per your engine manufacturer's instructions to fill the new filter with fuel.
- Check for any leaks at the connections before starting the engine.
Troubleshooting & FAQ
How do I know if this filter fits my engine?
The best way is to match your existing part number to those listed in our Part Number Matrix. This filter is a universal replacement for Johnson/Evinrude 398319, Mercury 802128A1, Yamaha GP1-U775C-10-00 and others that use a 3/8" fuel line.
What are the signs of a clogged fuel filter?
Common symptoms include engine sputtering, loss of power, difficulty starting, or stalling, especially under load. The clear housing on this filter allows you to visually inspect for water or debris.
What is the recommended replacement interval?
For optimal performance and engine protection, we recommend replacing your inline fuel filter annually or every 100 hours of operation, whichever comes first. Refer to your engine's service manual for specific guidance.
Is this filter compatible with ethanol-blended fuels?
Yes, this filter is approved for use with modern gasoline, including ethanol blends like E10. The components are designed to resist degradation from ethanol.
What direction should the filter be installed?
The filter has an arrow printed on the housing that indicates the direction of fuel flow. This arrow must point away from the fuel tank and towards the engine.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out 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
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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