Aftermarket Fuel Filter for MerCruiser Gen III Cool Fuel Systems – Replaces 35-866171A01, 8M0093688
Aftermarket Fuel Filter for MerCruiser Gen III Cool Fuel Systems – Replaces 35-866171A01, 8M0093688 is backordered and will ship as soon as it is back in stock.
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Aftermarket Fuel Filter for MerCruiser Gen III Cool Fuel Systems – ...
Aftermarket Fuel Filter for MerCruiser Gen III Cool Fuel Systems – 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 MerCruiser engines equipped with the GEN III Cool Fuel system. Installed inside the Cool Fuel module, it helps remove contaminants from the gasoline supply before fuel reaches the engine.
This listing is for a single replacement filter element, not a complete fuel module and not a multi-part filter kit. It is listed as a cross-reference for MerCruiser part numbers 35-866171A01, 35-8M0093688, 866171A01, and 8M0093688. Sierra reference 18-7977 is also associated with this filter application.
- For gasoline fuel systems using the MerCruiser GEN III Cool Fuel module.
- Internal filter element installed within the fuel-module housing.
- Single replacement component for maintenance or service.
- Aftermarket replacement; not an OEM-branded Mercury or MerCruiser part.
Part Number Matrix
Use the references below to compare the filter with the element currently installed in your fuel module. Part-number references do not replace confirmation of the complete engine model, serial-number range, and Cool Fuel system configuration.
| Reference type | Part number | Notes |
|---|---|---|
| MerCruiser | 35-866171A01 | Primary replacement reference |
| MerCruiser | 35-8M0093688 | Additional listed reference |
| MerCruiser | 866171A01 | Number without the 35- prefix |
| MerCruiser | 8M0093688 | Additional replacement reference |
| Sierra | 18-7977 | Aftermarket reference for the GEN III Cool Fuel system fuel filter |
Engine & Model Compatibility
Catalog information associates this filter application with MerCruiser GEN III Cool Fuel systems. The documented model applications include the following:
| Brand | Model application | System condition | Reference |
|---|---|---|---|
| MerCruiser | 350 MAG MPI Alpha/Bravo | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | 350 MAG MPI Horizon Alpha/Bravo | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | 350 MAG MPI Horizon MIE | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | 350 MAG MPI MIE | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | 496 MAG | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | 496 MAG H.O. | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | 5.0 MPI Alpha/Bravo | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | 8.1L Inboard | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | 8.1L Inboard H.O. | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | MX 6.2L MPI Alpha/Bravo | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | MX 6.2L MPI Horizon Alpha/Bravo | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | MX 6.2L MPI Horizon MIE | GEN III Cool Fuel system | 35-866171A01 |
| MerCruiser | MX 6.2L MPI MIE | GEN III Cool Fuel system | 35-866171A01 |
Applications and serial-number coverage can vary by engine configuration. Confirm that your engine uses the GEN III Cool Fuel module and compare the original filter markings before ordering. The 8.2L applications shown in unrelated catalog entries should not be treated as confirmed for this single filter unless the existing filter and fuel-module configuration match the listed references.
Technical Specs
- Product Type
- Fuel filter element
- Application
- MerCruiser GEN III Cool Fuel system
- Fuel Type
- Gasoline
- Installation
- Internal installation within the Cool Fuel module housing
- Part configuration
- Single replacement element
- Aftermarket status
- Aftermarket replacement, not OEM-branded
- Primary cross-reference
- 35-866171A01
- Additional references
- 35-8M0093688, 866171A01, 8M0093688, Sierra 18-7977
What's in the Box
- 1 x aftermarket fuel filter element
No complete fuel-module housing, fuel pump, or separate filter kit components are included.
Installation Notes
- Turn the engine off, disconnect the battery, and allow the engine to cool.
- Relieve fuel-system pressure according to the applicable MerCruiser service information before opening the fuel module.
- Locate the GEN III Cool Fuel module and place absorbent material around the housing to contain spilled fuel.
- Open the housing according to the manufacturer's service procedure and note the orientation of the existing filter element.
- Remove the old element and inspect the housing, sealing surfaces, and related seals for contamination or damage.
- Install the replacement element in the correct orientation and ensure it is fully seated.
- Reinstall the housing cover and tighten fasteners to the manufacturer's specified torque.
- Reconnect the battery, prime the fuel system as required, and inspect carefully for fuel leaks before operating the engine.
Fuel-system service involves flammable fuel. Use appropriate ventilation, keep sparks and flames away from the work area, and follow the engine service manual.
Troubleshooting & FAQ
How do I confirm that this filter fits my engine?
Confirm that your MerCruiser engine uses the GEN III Cool Fuel module, then compare the original filter number with 35-866171A01, 35-8M0093688, 866171A01, 8M0093688, or Sierra 18-7977. Model and serial-number details should also be checked against the applicable service information.
What are common signs of a restricted fuel filter?
Possible symptoms include hesitation, loss of power under load, rough running, stalling, or difficulty starting. These symptoms can have several causes, so inspect the complete fuel system before replacing the filter.
Is this a complete fuel filter kit?
No. This listing is for one replacement fuel filter element. It does not include a complete Cool Fuel module, fuel pump, housing, or unrelated filter components.
Can the filter element be cleaned and reused?
No. A used filter element should be replaced rather than cleaned and reused. Follow the replacement interval and inspection guidance in your engine service manual.
Is this an OEM part?
No. This is an aftermarket replacement intended to match the listed application and reference numbers. Mercury, MerCruiser, and Sierra names and numbers are used only to identify compatibility and cross-reference information.
Safety & Important Information
- Verify the original filter number and GEN III Cool Fuel module configuration before purchase.
- Do not rely on engine displacement alone to confirm compatibility.
- Use the correct service procedure and torque specifications for your engine.
- Professional installation is recommended for fuel-system service.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- We supply aftermarket marine replacement parts for service and maintenance applications.
- Product references are provided to help customers compare replacement components accurately.
- For the best fit, match the existing part number and system configuration before ordering.
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