Fuel Filter Element – Fits MerCruiser 5.0L, 5.7L, 6.2L, 8.1L, 8.2L Engines (Replaces 35-866171A01, 8M0093688)

Fuel Filter Element – Fits MerCruiser 5.0L, 5.7L, 6.2L, 8.1L, 8.2L Engines

This fuel filter element is designed for MerCruiser V8 engines from 2004 and newer that are equipped with the GEN III Cool Fuel system. It fits a wide range of models, including 5.0L, 5.7L, 6.2L, 8.1L, and 8.2L versions, providing reliable filtration to protect your engine's fuel injectors and internal components.

It serves as a direct replacement for Mercury part numbers 35-866171A01 (which is superseded by 8M0093688), and aftermarket equivalents like Sierra 18-7977.

• Installation Type: Installs internally within the GEN III Cool Fuel module housing.
• Fuel Compatibility: Designed for use with gasoline engines.
• Function: Critical for maintaining fuel system health by removing contaminants.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Fuel Filter Element (Replaces 35-866171A01, 8M0093688)

Installation Guide

1. Ensure the engine is off and cool. Disconnect the boat's battery for safety.
2. Relieve the fuel system pressure according to your engine's service manual. This is a critical safety step.
3. Locate the GEN III Cool Fuel module, typically mounted on the port side of the engine.
4. Place a rag or container under the module to catch any fuel that may spill.
5. Carefully remove the screws or bolts that secure the module's top housing cover.
6. Lift the cover to expose the old fuel filter element.
7. Remove the old filter and any associated O-rings or seals. Note their orientation.
8. Wipe the inside of the housing clean with a lint-free cloth.
9. Install the new fuel filter element, making sure it is seated correctly within the housing.
10. Reinstall the housing cover with its seal and tighten the fasteners to the manufacturer's specifications.
11. Reconnect the battery.
12. Prime the fuel system by cycling the ignition key a few times without starting the engine. Carefully inspect the module for any fuel leaks before operation.

Troubleshooting & FAQ

How do I confirm this filter fits my specific MerCruiser engine?
This filter fits MerCruiser engines from 2004+ with a GEN III Cool Fuel System. The most reliable way to confirm is by matching your engine's serial number to the ranges listed in the compatibility table above. The OEM part numbers for this filter are 35-866171A01 and 8M0093688.

What are common symptoms of a failing fuel filter?
A clogged or dirty fuel filter can cause symptoms like engine hesitation under load, stalling at idle, difficulty starting, or a general loss of performance and top speed.

How often should this fuel filter be replaced?
For preventative maintenance, it is recommended to replace your fuel filter annually or every 100 hours of operation, whichever comes first. Always refer to your MerCruiser service manual for specific maintenance schedules.

Is this a genuine Mercury/MerCruiser part?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.