35-864572 Fuel Filter for Mercury MerCruiser | JLM Marine

35-864572 Fuel Filter for Mercury MerCruiser

This high-quality marine fuel filter is designed to fit MerCruiser MPI & EFI engines with boost pump, including 8.1L & 496 CID models equipped with 3/8" I.D. fuel lines. Engineered to deliver reliable filtration and fuel system protection, this replacement filter ensures optimal engine performance in demanding marine environments.

This aftermarket fuel filter directly replaces MerCruiser/Mercury 35-864572, 35-864572T, 35-864572T01, as well as Mallory 9-37826 and Sierra 18-7721, providing broad compatibility across multiple part number systems.

• Fits MPI & EFI engines with boost pump (8.1L & 496 CID)
• Designed for 3/8" I.D. fuel lines
• Direct replacement for multiple OEM and aftermarket part numbers

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.

Technical Specifications

Package Contents

• 1 x Marine Fuel Filter

Installation Guide

1. Turn off the engine and disconnect the battery to ensure safety during installation.
2. Relieve fuel system pressure by loosening the fuel filler cap and allowing residual pressure to escape.
3. Locate the existing fuel filter on your MerCruiser engine, typically along the fuel line between the tank and the engine.
4. Place a drip pan or absorbent cloth beneath the filter to catch any residual fuel spillage.
5. Carefully disconnect the fuel line fittings from both ends of the old filter. Note the flow direction arrow on the old filter.
6. Remove the old fuel filter from its mounting bracket or clamps.
7. Install the new fuel filter in the same orientation, ensuring the flow direction arrow points toward the engine.
8. Reconnect the fuel line fittings securely to both ends of the new filter, ensuring all connections are tight.
9. Double-check all fittings and connections for secure attachment and proper alignment.
10. Reconnect the battery and turn the ignition to the on position (without starting) to prime the fuel system. Check for leaks around the filter connections.
11. Start the engine and allow it to idle for a few minutes while inspecting all connections for fuel leaks.
12. If no leaks are detected, perform a test run at various speeds to ensure proper fuel delivery and engine performance.

Troubleshooting & FAQ

Q: How do I confirm this fuel filter fits my MerCruiser engine?
A: Verify that your engine is an MPI or EFI model with a boost pump (8.1L or 496 CID) using 3/8" I.D. fuel lines. Cross-reference your current filter part number with the numbers listed in the Part Number Cross-Reference section above, or consult your engine parts diagram.

Q: How often should I replace my marine fuel filter?
A: Most manufacturers recommend replacing the fuel filter annually or every 100 hours of engine operation, whichever comes first. If you operate in areas with contaminated fuel or notice performance issues, consider more frequent replacement.

Q: What are the signs that my fuel filter needs replacement?
A: Common symptoms include engine hesitation, difficulty starting, rough idling, loss of power at high speeds, or fuel starvation. A clogged filter restricts fuel flow and reduces engine performance.

Q: Can I install this filter in either direction?
A: No, fuel filters must be installed with the correct flow direction. Look for the arrow on the filter body and ensure it points toward the engine to maintain proper fuel flow and filtration.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist, 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.