Professional Unterminated EFI Harness for Custom FuelTech Installations

The FuelTech FT550 Unterminated Wiring Harness (B Connector) is designed for experienced builders and fabricators who require full control over their EFI wiring layout. This harness provides a direct, OEM-style connection to the FuelTech FT550 ECU while leaving all conductors unterminated for complete customization.

Ideal for race cars, engine swaps, and fully custom EFI builds, this harness allows you to design and route your wiring exactly how your application demands—without unnecessary adapters, extensions, or splices.

OEM FuelTech ECU Connector with Full Custom Wiring Freedom

This harness features a genuine FuelTech FT550 B connector that plugs directly into the ECU, ensuring proper pin fitment, terminal retention, and long-term electrical reliability.

All wires exit the connector unterminated, giving you the flexibility to integrate sensors, power distribution, and outputs according to your specific chassis and engine configuration.

Built for Motorsports & Standalone EFI Systems

The wiring used in this harness is suitable for EFI and motorsports applications, making it appropriate for high-performance and competition vehicles where reliability and serviceability are critical.

Each wire is clearly printed with pin identification, significantly reducing the chance of wiring errors during installation and streamlining the build process for complex systems.

Flexible Length for Clean ECU Placement

This unterminated harness is offered in a 10-foot length, allowing flexible ECU mounting in the cabin, trunk, or other remote locations. The extended length supports clean routing in custom builds without requiring additional extensions.

Ideal Applications

This harness is commonly used for:

• Custom EFI wiring from scratch

• FuelTech FT550 standalone ECU installations

• Race cars and motorsports applications

• Engine swaps and custom chassis wiring

• Professional and DIY fabrication projects

What’s Included

• 1× FuelTech FT550 Unterminated Wiring Harness

• OEM FuelTech B Connector pre-installed

• Unterminated, labeled conductors for full customization

Installation Notes

This product is intended for advanced wiring projects. Professional wiring knowledge, correct pinout references, and proper crimping tools are required for installation.

Improper wiring can result in ECU or component damage. Professional installation is strongly recommended.

Fueltech Wiring Diagrams Here