Fuel Filter Housing Assembly – Fits Yanmar Marine Diesel Engines (Replaces 121370-55601)
Fuel Filter Housing Assembly – Fits Yanmar Marine Diesel Engines (Replaces 121370-55601) 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
Fuel Filter Housing Assembly – Fits Yanmar Marine Diesel Engines (R...
Product Details
This high-quality aftermarket Fuel Filter Housing Assembly – Fits Yanmar Marine Diesel Engines (Replaces 121370-55601) provides reliable protection for Yanmar marine diesel engines. It effectively filters water and contaminants from diesel fuel, ensuring smooth engine performance and longevity in marine conditions, and fits a wide range of models including the 1GM, 2GM, 3GM, 2YM, and 3YM series.
This unit is a direct interchange for Yanmar part numbers 121370-55600, 121370-55601, 124790-55601, and 128990-55600.
- Features a vehicle-specific mounting design for secure installation.
- Constructed from corrosion-resistant metal to withstand harsh marine environments.
- Includes a compatible filter element (121370-55050) for a complete setup.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 121370-55600 |
| Yanmar | 121370-55601 |
| Yanmar | 124790-55601 |
| Yanmar | 128990-55600 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This assembly fits a range of Yanmar marine diesel engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yanmar | 1GM | 121370-55601 | ||||
| Yanmar | 1GM10 | 121370-55601 | ||||
| Yanmar | 2GM | 121370-55601 | ||||
| Yanmar | 2GM20 | 121370-55601 | ||||
| Yanmar | 2QM15 | 121370-55601 | ||||
| Yanmar | 2QM20 | 121370-55601 | ||||
| Yanmar | 2YM15 | 121370-55601 | ||||
| Yanmar | 2YM20 | 121370-55601 | ||||
| Yanmar | 3GM | 121370-55601 | ||||
| Yanmar | 3GM30 | 121370-55601 | ||||
| Yanmar | 3QM30 | 121370-55601 | ||||
| Yanmar | 3YM15 | 121370-55601 | ||||
| Yanmar | 3YM20 | 121370-55601 | ||||
| Yanmar | 3YM30 | 121370-55601 | ||||
| Yanmar | 3YM30AE | 121370-55601 | ||||
| Yanmar | 3YM30R | 121370-55601 | ||||
| Yanmar | 3YM27A | 121370-55601 |
Technical Specs
- Product Type
- Fuel Filter Housing Assembly
- Installation
- Vehicle-specific mounting
- Fuel Type
- Diesel
- Housing Material
- Corrosion-resistant metal
- Dimensions
- 13.0cm (H) x 8.5cm (W) x 8.5cm (L)
- Weight
- 0.5 kg (1.1 lb)
- Other Technical Attributes
- Compatible with standard filter element 121370-55050
What’s in the Box
- 1 x Housing unit (121370-55601)
- 1 x Filter element (121370-55050)
Installation Notes
- Turn off the fuel supply valve and ensure the engine is completely cool before starting.
- Place an appropriate catch pan under the existing fuel filter housing to collect any fuel spillage.
- Carefully disconnect the inlet and outlet fuel lines from the old housing assembly.
- Loosen and remove the mounting bolts to detach the old housing from the engine block.
- Thoroughly clean the mounting surface to ensure a proper seal with the new assembly.
- Securely mount the new fuel filter housing assembly using the original hardware.
- Reconnect the fuel lines to the new housing, ensuring all fittings are tight to prevent leaks.
- Prime the fuel system according to your Yanmar engine's specific service manual instructions.
- Open the fuel supply valve and meticulously check the housing and connections for any signs of leakage.
- Start the engine and let it run for a few minutes, performing a final visual inspection for leaks.
Troubleshooting & FAQ
How do I confirm this fits my Yanmar engine?
This assembly is designed for Yanmar 1GM, 2GM, 3GM, 2YM, and 3YM series engines. The most reliable method is to check if your old part's number is listed as a direct replacement (e.g., 121370-55601, 124790-55601). Always compare product photos with your part before purchase.
What are the symptoms of a bad fuel filter housing?
Common signs include visible fuel leaks or stains on the housing, physical cracks, difficulty starting the engine, unstable idling, or a loss of power. If you see debris or water in the fuel bowl, the filter is doing its job but may need service.
How often should I replace the internal filter element?
To ensure engine health, replace the filter element (121370-55050) based on your Yanmar service manual's recommendations, typically every 250 operational hours or at least once a year. If you operate in areas with poor fuel quality, more frequent changes may be necessary.
When should I replace the entire assembly vs. just the filter?
Replace the filter element as part of routine maintenance. You should replace the entire housing assembly if it is cracked, warped, corroded, or if the fuel line connections are stripped or leaking, as this can lead to fuel starvation or hazardous leaks.
Are special tools needed for installation?
Standard mechanical hand tools, such as wrenches and a socket set, are typically sufficient for this installation. No proprietary tools are required. We recommend consulting your engine's official service manual for detailed procedures.
What is the difference between OEM and aftermarket parts?
This listing is an aftermarket replacement (not OEM). It has been engineered to meet or exceed OEM-level specifications using comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure quality and consistency.
How much is shipping and how fast is it?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most locations; expedited shipping options and costs, where available, will be displayed at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use conditions. Should an issue arise, contact our support team with your order details. Returns are accepted within our standard window if the item is unused and in its original packaging. Please see our full 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
- 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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