35-884380T Fuel Filter for Mercury Mariner Verado Optimax DFI | JLM Marine

35-884380T Fuel Filter for Mercury Mariner Verado Optimax DFI

This high-quality fuel filter element is designed for Mercury and Mariner outboard motors ranging from 75 HP to 225 HP, including all Verado, Optimax, and DFI series. It fits 1.5L and 3.0L DFI outboards that utilize a vapor separator with a top screw-in type filter, as well as L4 and L6 Verado models and the latest V-6 EFI/DFI engines.

This aftermarket replacement directly crosses to multiple OEM part numbers including 35-8M0020349, 35-8M0122423, 35-8M0060041, 35-884380T, and others, ensuring broad compatibility across Mercury and Mariner engine families.

• Top screw-in design for vapor separator systems
• Compatible with DFI, Optimax, and Verado fuel systems
• Fits both 3-cylinder and multi-cylinder configurations

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.

Package Contents

• 1 × Fuel Filter Element (as pictured)

Installation Guide

1. Ensure the engine is turned off and allow it to cool completely before beginning work.
2. Relieve fuel system pressure by removing the fuel cap and allowing vapors to escape.
3. Locate the vapor separator unit on your engine; the filter is mounted on top with a screw-in cap.
4. Use a suitable wrench or filter tool to carefully unscrew the old filter cap counterclockwise. Have a rag ready to catch any residual fuel.
5. Remove the old fuel filter element from the vapor separator housing and inspect the housing for debris or contamination.
6. Clean the mating surface on the vapor separator housing to ensure a proper seal.
7. Insert the new fuel filter element into the housing, ensuring it seats correctly and the O-ring or gasket is properly positioned.
8. Thread the filter cap back into the housing by hand, then tighten to the manufacturer's recommended torque specification (typically hand-tight plus a quarter turn).
9. Check all connections for proper seating and ensure no fuel leaks are present.
10. Reinstall the fuel cap and prime the fuel system according to your engine's procedure (typically turning the ignition key to the on position several times without starting).
11. Start the engine and allow it to idle for a few minutes while inspecting the filter area for leaks.
12. If any leaks are detected, shut down the engine immediately and recheck the filter installation and torque.

Troubleshooting & FAQ

Q: How do I confirm this fuel filter fits my specific Mercury or Mariner engine?
A: Cross-reference your engine's model, horsepower, and year with the compatibility table above. You can also verify your engine's serial number using the Mercury Serial Number Guide linked in the Compatible Engine Models section, or check your engine's parts diagram to confirm the OEM part number matches one of the cross-references listed.

Q: How often should I replace the fuel filter on my Verado or Optimax engine?
A: Mercury recommends inspecting and replacing the fuel filter annually or every 100 hours of operation, whichever comes first. If you notice performance issues such as rough idling, hesitation, or difficulty starting, check the filter sooner as contamination may have occurred.

Q: What are the signs that my fuel filter needs replacement?
A: Common symptoms include engine hesitation or surging at high RPM, difficulty starting, reduced top speed, rough idle, or the engine stalling under load. A clogged filter restricts fuel flow and can cause poor engine performance.

Q: Will this filter work with both 2-stroke DFI and 4-stroke Verado engines?
A: Yes, this filter is designed to fit both 2-stroke DFI/Optimax models (75–225 HP) and 4-stroke Verado models (135–200 HP) that use a vapor separator with a top screw-in filter design. Always verify compatibility with your specific model and serial number range.

Q: Is this an OEM Mercury part or an aftermarket replacement?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.