Aftermarket Fuel Filter for MerCruiser Gen III Cool Fuel System – Replaces 35-866171A01, 8M0093688
Aftermarket Fuel Filter for MerCruiser Gen III Cool Fuel System – Replaces 35-866171A01, 8M0093688 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Aftermarket Fuel Filter for MerCruiser Gen III Cool Fuel System – R...
Aftermarket Fuel Filter for MerCruiser Gen III Cool Fuel System – Replaces 35-866171A01, 8M0093688 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket fuel filter is designed for Mercury MerCruiser engines equipped with the Generation III Cool Fuel System. It helps remove fuel contaminants before they reach the engine's fuel system and is intended as a replacement for the filter specified by the listed manufacturer and aftermarket references.
The filter is listed for MerCruiser applications including 350 MAG MPI Alpha/Bravo and Horizon models, 496 MAG and 496 MAG H.O. engines, 5.0 MPI Alpha/Bravo models, 8.1L inboard and 8.1L H.O. engines, and MX 6.2L MPI Alpha/Bravo and Horizon models. Always confirm the Cool Fuel module and original filter reference before ordering.
- Replacement fuel filter for the MerCruiser Gen III Cool Fuel System.
- Helps protect fuel-system components from dirt and other fuel contaminants.
- Designed for gasoline-powered marine applications.
- Single replacement filter; housing and other fuel-system components are not included.
Part Number Matrix
Use the references below to compare the replacement filter with the number on your existing component.
| Brand or Reference | Part Number |
|---|---|
| Mercury / MerCruiser OEM reference | 35-866171A01 |
| Mercury / MerCruiser OEM reference | 8M0093688 |
| Mercury / MerCruiser OEM reference | 35-8M0093688 |
| Mercury / MerCruiser OEM reference | 866171A01 |
| Sierra aftermarket reference | 18-7977 |
Engine & Model Compatibility
This filter is intended for the specific MerCruiser Gen III Cool Fuel applications listed below. Engine displacement alone does not confirm fitment; the engine must use the matching fuel module and filter arrangement.
| Brand | Engine or Model Application | Fuel System | Fitment Condition |
|---|---|---|---|
| Mercury MerCruiser | 350 MAG MPI Alpha/Bravo; 350 MAG MPI Horizon Alpha/Bravo; 350 MAG MPI Horizon MIE; 350 MAG MPI MIE | Gen III Cool Fuel | Verify the matching module and original filter reference |
| Mercury MerCruiser | 496 MAG and 496 MAG H.O. | Gen III Cool Fuel | Verify the matching module and original filter reference |
| Mercury MerCruiser | 5.0 MPI Alpha/Bravo | Gen III Cool Fuel | Verify the matching module and original filter reference |
| Mercury MerCruiser | 8.1L Inboard and 8.1L Inboard H.O. | Gen III Cool Fuel | Verify the matching module and original filter reference |
| Mercury MerCruiser | MX 6.2L MPI Alpha/Bravo; MX 6.2L MPI Horizon Alpha/Bravo; MX 6.2L MPI Horizon MIE; MX 6.2L MPI MIE | Gen III Cool Fuel | Verify the matching module and original filter reference |
Technical Specs
- Product Type
- Fuel filter
- Application
- MerCruiser Gen III Cool Fuel System
- Fuel Type
- Gasoline
- Installation
- Install in the compatible Cool Fuel module according to the engine service procedure
- Brand Status
- Aftermarket replacement; not an OEM-branded component
What's in the Box
- 1 × Fuel filter
Installation Notes
- Turn off the engine and allow it to cool completely.
- Disconnect the battery and follow the manufacturer's procedure for relieving fuel-system pressure.
- Locate the Gen III Cool Fuel module and remove the cover or access components as specified by the service manual.
- Remove the existing filter and note its orientation before installation.
- Inspect the housing, seals, and surrounding fuel lines. Replace damaged seals or components as required.
- Install the new filter in the correct orientation and position.
- Reassemble the module securely using the service manual's tightening procedure.
- Reconnect the battery, prime the fuel system, start the engine, and check carefully for fuel leaks.
Troubleshooting & FAQ
How do I confirm that this filter fits my engine?
Confirm that your MerCruiser engine uses the Generation III Cool Fuel System and compare the original filter with the listed references, including 35-866171A01, 8M0093688, or Sierra 18-7977. Displacement alone is not sufficient to confirm fitment.
What are common signs of a restricted fuel filter?
Possible symptoms include hard starting, hesitation, loss of power, rough running, or stalling under load. These symptoms can have other causes, so diagnose the complete fuel system before replacing parts.
Can I clean and reuse this filter?
No. A contaminated or restricted filter should be replaced rather than cleaned and reused.
Is this an OEM Mercury or MerCruiser filter?
No. This listing is for an aftermarket replacement filter associated with the listed Mercury/MerCruiser and Sierra reference numbers.
What should I do before servicing the filter?
Shut down the engine, disconnect the battery, relieve fuel-system pressure according to the manufacturer's service instructions, and keep ignition sources away from spilled fuel. Professional installation is recommended when required by the service procedure.
Safety & Important Information
- Verify the original filter number, fuel module design, engine model, and service-manual requirements before ordering.
- Do not rely on engine displacement alone to determine compatibility.
- Use only with the fuel type and application specified by the engine manufacturer.
- Fuel-system service involves flammable fuel and should be performed by a qualified technician when appropriate.
- This is an aftermarket replacement and is not manufactured or branded by Mercury Marine.
About Sea Sierra
- Marine Replacement Parts — Practical replacement components for common marine service applications.
- Application-Focused Listings — Product references and compatibility information are provided to support part-number verification.
- Value-Oriented Supply — Aftermarket options for routine maintenance and repair needs.
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