Mercury Fuel Supply Module Seal Kit – Fits Mercury/Mercruiser 65-600HP Outboards (Replaces 8M0133370)
Mercury Fuel Supply Module Seal Kit – Fits Mercury/Mercruiser 65-600HP Outboards (Replaces 8M0133370) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Mercury Fuel Supply Module Seal Kit – Fits Mercury/Mercruiser 65-60...
Product Details
This Mercury Fuel Supply Module Seal Kit provides the essential gaskets and seals needed to service the Fuel Supply Module (FSM) on compatible Mercury, Mariner, and Mercruiser 65-600HP 4-stroke outboard and inboard/sterndrive engines. It is designed to restore factory sealing performance during maintenance or repair.
The kit serves as a direct replacement for Mercury OEM part numbers 8M0133370 and the earlier, superseded version 8M0057679.
- Engineered as a direct OEM-equivalent replacement for a precise fit.
- Includes necessary seals to prevent fuel leaks after servicing the FSM.
- Constructed from durable rubber and polymer compounds suitable for gasoline fuel systems.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 8M0133370 | |
| Mercury | 8M0057679 | Earlier version, superseded by 8M0133370 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for Mercury 4-stroke outboard engines equipped with a Fuel Supply Module (FSM). Please verify your specific engine requirements before ordering.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | Outboard | 65-600 | 4-Stroke | 8M0133370 | For FSM-equipped models |
Technical Specs
- Product Type
- Fuel Supply Module (FSM) Seal Kit
- Installation
- OEM replacement
- Fuel Type
- Gasoline
- Housing Material
- Rubber/Polymer (seals and gaskets)
- Product Dimensions
- 14.0" L x 12.0" W x 1.5" H
- Weight
- 0.16 lb (0.07 kg)
- Other Technical Attributes
- For fuel system service and maintenance
What’s in the Box
- 1 x Seal Kit for Fuel Supply Module (Replaces 8M0133370)
Installation Notes
- Disconnect the vessel's battery and safely relieve all pressure from the fuel system.
- Consult your engine's official service manual for specific instructions on locating and accessing the Fuel Supply Module (FSM).
- Carefully disconnect all fuel lines, hoses, and electrical connectors attached to the FSM.
- Remove the FSM from the engine block.
- Disassemble the FSM on a clean workbench, paying close attention to the orientation and location of each original seal and gasket.
- Thoroughly clean all mating surfaces to remove any old sealant, corrosion, or debris.
- Install the new seals and gaskets from the kit, ensuring each is seated correctly in its groove.
- Reassemble the FSM and torque all fasteners to the manufacturer’s specified values.
- Reinstall the FSM onto the engine, reconnecting all lines and electrical plugs.
- Prime the fuel system according to the service manual and carefully inspect for any leaks before starting the engine.
Troubleshooting & FAQ
How do I know if my FSM seals are failing?
Common signs of failing FSM seals include visible fuel leaks around the module, a strong smell of gasoline, difficulty starting the engine, poor engine performance, or diagnostic codes related to fuel pressure.
Will this kit fit all Mercury engines from 65 to 600 HP?
This kit is designed for 4-stroke Mercury and Mercruiser engines within that power range that are equipped with a Fuel Supply Module (FSM). It is critical to verify that your engine model uses part number 8M0133370, as not all models do. Always check your service manual or existing part.
When should these seals be replaced?
The seals should be replaced any time the Fuel Supply Module is opened for service (such as for a fuel pump replacement) or if any leaks or performance issues related to the FSM are diagnosed.
What is the difference between this kit and the older 8M0057679 kit?
Part number 8M0133370 is the most current version that supersedes the older 8M0057679 kit. It may include updated materials or additional components for broader compatibility, ensuring the best possible seal.
Is this a complete kit for rebuilding the FSM?
This is a seal kit, containing the primary gaskets and O-rings needed when disassembling and reassembling the FSM housing. It does not include internal components like fuel pumps or regulators.
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.
Payment & Security
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