Fuel Feed Pump Gasket – Fits Yanmar 1GM, 2GM, 3GM Series Marine Engines (Replaces 121520-01851)
Fuel Feed Pump Gasket – Fits Yanmar 1GM, 2GM, 3GM Series Marine Engines (Replaces 121520-01851) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Fuel Feed Pump Gasket – Fits Yanmar 1GM, 2GM, 3GM Series Marine Eng...
Product Details
This aftermarket Fuel Feed Pump Gasket is engineered to create a secure seal for fuel feed pumps on a wide range of Yanmar marine and industrial diesel engines. It is designed for use with the 1GM, 2GM, and 3GM series, among others, ensuring reliable, leak-free performance between the fuel feed pump and the engine block.
It serves as a direct replacement for Yanmar OEM part number 121520-01851.
- Installs between the fuel feed pump and the engine block.
- Engineered for marine and industrial diesel fuel environments.
- This is a high-quality aftermarket part built to meet or exceed OEM specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 121520-01851 |
Engine & Model Compatibility
Confirm your engine model in the table below.
This gasket fits a number of popular Yanmar marine and industrial engines. Please check your specific model and part number to ensure proper fitment.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yanmar | 1GM | 4-Stroke | 121520-01851 | |
| Yanmar | 1GM10 | 4-Stroke | 121520-01851 | |
| Yanmar | 2GM | 4-Stroke | 121520-01851 | |
| Yanmar | 2GM20 | 4-Stroke | 121520-01851 | |
| Yanmar | 2GM20F | 4-Stroke | 121520-01851 | |
| Yanmar | 2GMF | 4-Stroke | 121520-01851 | |
| Yanmar | 3GM | 4-Stroke | 121520-01851 | |
| Yanmar | 3GM30 | 4-Stroke | 121520-01851 | |
| Yanmar | 3GM30F | 4-Stroke | 121520-01851 | |
| Yanmar | 3GMF | 4-Stroke | 121520-01851 | |
| Yanmar | 3HM35F | 4-Stroke | 121520-01851 | |
| Yanmar | 2TNE68-BL | 4-Stroke | 121520-01851 | |
| Yanmar | 2TNE68-BL2 | 4-Stroke | 121520-01851 | |
| Yanmar | 2TNE68C-BG | 4-Stroke | 121520-01851 | |
| Yanmar | 3TNA72L | 4-Stroke | 121520-01851 | |
| Yanmar | 3TNE68 | 4-Stroke | 121520-01851 | |
| Yanmar | 3TNE68-AC | 4-Stroke | 121520-01851 | |
| Yanmar | 3T72LE | 4-Stroke | 121520-01851 |
Technical Specs
- Product Type
- Fuel Feed Pump Gasket
- Installation
- Between fuel feed pump and engine block
- Fuel Type
- Diesel
- Dimensions
- 4.0" L x 14.0" W x 0.2" H
- Other Technical Attributes
- Genuine OEM part
What’s in the Box
- 1 x Fuel Feed Pump Gasket (121520-01851)
Installation Notes
- Disconnect the vessel's battery and ensure the engine is completely cool. Turn off the fuel supply valve.
- Clean the area around the fuel feed pump to prevent contaminants from entering the fuel system.
- Carefully disconnect the fuel lines from the pump. Have rags ready to catch any residual fuel.
- Unbolt and remove the old fuel feed pump and gasket from the engine block.
- Thoroughly clean both the engine block mounting surface and the new pump's mounting surface, ensuring they are free of old gasket material, oil, and debris.
- Place the new gasket onto the engine block, aligning it with the mounting holes.
- Mount the fuel feed pump over the new gasket and tighten the bolts to the manufacturer's specified torque.
- Reconnect the fuel lines, turn the fuel supply back on, and prime the fuel system if necessary.
- Reconnect the battery, start the engine, and carefully inspect for any leaks around the gasket and fuel lines.
Troubleshooting & FAQ
How do I know if my fuel pump gasket is failing?
Common signs of a bad fuel pump gasket include visible diesel fuel leaks around the pump's base, a strong smell of diesel in the engine bay, and poor engine performance or difficulty starting due to air entering the fuel system.
Should I use sealant or gasket dressing with this part?
In most cases, this gasket is designed to be installed dry. Applying sealants can sometimes cause the gasket to slip or fail prematurely. Always consult your engine's service manual for specific recommendations.
Will this gasket fit other Yanmar models like the YSM or QM series?
While some sources suggest cross-compatibility, this gasket is only guaranteed to fit the specific models listed in the compatibility table. Always verify your required part number (121520-01851) before ordering.
What could cause a new gasket to leak?
A new leak is often caused by an improperly prepared mounting surface (old gasket material or dirt remains), or bolts that are unevenly or incorrectly torqued. Ensure the surfaces are perfectly clean and bolts are tightened to the specified torque in a crossing pattern.
What is the difference between this and a genuine Yanmar gasket?
This is a high-quality aftermarket part designed to meet or exceed OEM specifications for fit, form, and function. It provides comparable performance and sealing properties to the original part at a better value.
How often should this gasket be replaced?
This gasket should be replaced any time the fuel feed pump is removed or replaced. It is not a routine maintenance item but should be inspected for leaks during regular engine checks.
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 a 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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