Electronic Fuel Injector – Fits Mercury/MerCruiser 4.3L-8.2L MPI Engines (Replaces 861260T)

Electronic Fuel Injector – Fits Mercury/MerCruiser 4.3L-8.2L MPI Engines (Replaces 861260T)

This electronic fuel injector is designed for Mercury/MerCruiser multi-port fuel injection (MPI) engines, including 4.3L, 5.0L, 5.7L, 6.2L, and 8.2L models manufactured between 1998 and 2001. It is engineered to provide precise fuel metering, promoting optimal engine performance and efficiency.

This component is a direct replacement for Mercury/MerCruiser OEM part numbers 861260 and 861260T. The injector is built with a durable plastic and metal housing to withstand the marine environment.

• Installation: Direct replacement, bolt-in design.
• Fuel Compatibility: Designed for gasoline applications.
• Package Includes: One fuel injector unit.

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 Injector (Replaces 861260T)

Installation Guide

1. Disconnect Power: Safely disconnect the boat's battery before starting work.
2. Relieve Fuel Pressure: Follow the manufacturer's procedure to safely relieve pressure from the fuel system.
3. Access the Injector: Remove any components obstructing access to the fuel rail and injector.
4. Disconnect: Unplug the electrical connector from the fuel injector.
5. Remove Fuel Rail: Unfasten the fuel rail mounting bolts. Carefully lift the rail with injectors attached.
6. Remove Old Injector: Remove the retaining clip and gently twist and pull the old injector from the fuel rail.
7. Install New Injector: Lightly lubricate the new injector's O-rings with clean engine oil and press it firmly into the fuel rail until the clip can be reinstalled.
8. Reinstall Fuel Rail: Secure the fuel rail back onto the intake manifold and tighten bolts to the specified torque.
9. Reconnect: Plug the electrical connector back onto the new injector.
10. Check for Leaks: Reconnect the battery. Turn the key to the "on" position (without starting) several times to prime the system. Carefully inspect the injector and fuel rail for any leaks.
11. Final Test: Once confirmed leak-free, start the engine and check for smooth operation.

Troubleshooting & FAQ

Q: How do I confirm this injector fits my engine?
A: Verify your engine details against the compatible models table. This injector is specifically for MerCruiser MPI engines (approx. 1998-2001) that use the ECM 555 control module and OEM part 861260T. Checking your existing part number is the most reliable method.

Q: What are the common signs of a failing fuel injector?
A: Symptoms of a faulty injector include rough idling, engine misfires (which may trigger a check engine light), poor acceleration, reduced fuel economy, and difficulty starting.

Q: Can I replace just one injector, or should I replace them all?
A: While you can replace a single failed injector, it is often recommended to replace them as a set. This ensures balanced fuel flow and consistent performance across all cylinders, as injectors can wear at similar rates.

Q: OEM vs. Aftermarket?
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.