B3R Flex Fuel Sensor Kit

Run gasoline, ethanol, or anything in between—with flex fuel capability.

The B3R Flex Fuel Sensor Kit makes it easy to add flex fuel functionality to compatible Holley EFI and B3R Gateway systems. Each kit includes a GM flex fuel sensor and wiring harness for integration with your EFI setup.

By measuring ethanol content in real time, the sensor allows a properly configured Holley EFI system to adjust the tune as fuel composition changes. Switch between pump gasoline, E85, and blends in between without manually monitoring ethanol content or reflashing your tune every time you fill up.

Unlock More Performance

Ethanol offers significant advantages for high-performance applications, especially supercharged and turbocharged combinations. Its increased knock resistance can support more aggressive tuning and help unlock additional power when the engine and fuel system are properly configured.

Whether you're running pump gas for everyday driving or ethanol for maximum performance, the B3R Flex Fuel Sensor Kit helps your combination adapt to changing fuel content.

Kit Includes

• GM flex fuel sensor

• Wiring harness for Holley EFI integration

Features & Benefits

• Adds flex fuel capability to compatible Holley EFI and B3R Gateway systems

• Monitors ethanol content in real time

• Supports gasoline, ethanol, and mixed fuel blends

• Eliminates the need to manually monitor ethanol content

• Helps eliminate the need for reflashing when switching fuels, provided the system is properly configured

• Ideal for high-performance and forced-induction applications

Make the most of your fuel and your combination with the B3R Flex Fuel Sensor Kit.

Flex fuel operation requires compatible ECU hardware, proper sensor configuration, an appropriate flex fuel calibration, and a fuel system capable of supporting the selected fuel and power level.