Fuel Filter Kit – Fits MerCruiser 2.5L, 3.0L, 3.7L, 4.3L Sterndrive Engines (Replaces 35-803897Q1, 8M0046752)

Fuel Filter Kit – Fits MerCruiser 2.5L, 3.0L, 3.7L, 4.3L Sterndrive Engines

This fuel filter kit is designed for a range of MerCruiser 2.5L, 3.0L, 3.7L, and 4.3L 4-stroke sterndrive engines, covering specific models manufactured from the 1980s through the 2000s. It serves as a direct replacement for filters located within the lower canister of the mechanical fuel pump.

This kit is a direct replacement for MerCruiser part numbers 35-803897Q1, 8M0046752, 35-11004A1, 35-11004Q2, 35-803897, 35-11004, 803897Q1, and 803897K1, as well as several aftermarket equivalents.

• Installation Location: Mounts inside the lower canister of the engine's mechanical fuel pump.
• Complete Assembly: Includes the filter element, spring, and all necessary rubber gaskets for a full replacement.
• Fuel Compatibility: Designed for use with gasoline fuel systems.

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 Filter Element
• 1 x Spring
• 3 x Rubber Rings/Gaskets

Installation Guide

1. Ensure the engine is off, cool, and the battery is disconnected for safety.
2. Locate the mechanical fuel pump, typically mounted on the side of the engine block.
3. Place a rag or small container underneath the pump to catch any fuel spillage.
4. Carefully unscrew and remove the lower canister of the fuel pump.
5. Take out the old filter, spring, and rubber gaskets, noting their order and orientation.
6. Clean the inside of the fuel pump canister and check the sealing surfaces for any debris.
7. Install the new spring first, followed by the new filter element.
8. Fit the new rubber gaskets/rings into their designated grooves to ensure a proper seal.
9. Thread the canister back onto the pump by hand until snug, then tighten gently with a wrench. Do not overtighten.
10. Reconnect the battery terminals.
11. Prime the fuel system according to your engine's manual and carefully check for any leaks around the pump before starting the engine.

Troubleshooting & FAQ

How do I confirm this fits my engine?
Check your engine's serial number and compare it to the ranges listed in the "Compatible Engine Models" table. This kit fits specific MerCruiser models from the 1980s to the 2000s that use a mechanical fuel pump with an internal cartridge-style filter. It is not for models with spin-on canister filters.

What are the signs that this filter needs to be replaced?
Common symptoms of a clogged or failing fuel filter include the engine struggling to start, hesitating under acceleration, losing power, or stalling unexpectedly. Regular replacement prevents fuel starvation and protects your fuel system.

How often should I replace my fuel filter?
For optimal engine performance and longevity, we recommend replacing the fuel filter at least once per season or every 100 hours of operation, whichever comes first. Refer to your engine's service manual for specific maintenance intervals.

OEM vs. Aftermarket?
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.