The Fuel It! Bluetooth Flex Fuel Kit delivers real-time ethanol content monitoring for your BMW equipped with the S63TU engine. Designed for drivers running E85 or blended ethanol fuels, this kit provides instant ethanol percentage readings through the LED display or via your mobile device using the Fuel-It!, BMS CANflex, or JB4 app.

This complete plug-and-play system installs in approximately 30 minutes and integrates with popular tuning platforms, including JB4, MHD, BM3, and EcuTek. The CANbus ECA supports standard flex fuel CANbus address formats and works with both flash-only vehicles and JB4-equipped setups.

Two kit configurations are available to match your tuning needs:

Complete Kit with CANbus ECA and Universal Harness
Includes a universal harness compatible with all platforms, including manual transmission vehicles and cars utilizing BM3 flex fuel tuning.

Complete Kit with Fuel-It! Bluetooth ECA
Includes a Bluetooth-enabled ECA designed for use with JB4 and the Fuel-It! app. Contains Bluetooth connectivity only and does not support CANbus integration.

Each kit includes premium components engineered for reliability and performance, such as a genuine Continental® ethanol sensor, billet aluminum fittings, and stainless steel braided fuel lines with protective nylon sheathing. CANflex ECAs support popular CANbus addresses including 0xec and 0x4cb.

Replacement fuel lines are also available.

Included in the Complete Kit with BMS CANbus ECA

• Genuine Continental ethanol sensor

• BMS CANflex LED ECA for use with JB4, MHD, and BM3

• Billet custom fittings

• Stainless steel braided fuel lines with black nylon sheathing

Included in the Complete Kit with Fuel-It! Bluetooth ECA

• Genuine Continental ethanol sensor

• Billet custom fittings

• Stainless steel braided fuel lines with black nylon sheathing

• Fuel-It! Bluetooth analyzer

• Bluetooth app and 5V analog output for JB4 or flash tuning

Wiring Information for BMS Bluetooth CANflex Harness

• Red: 12V switched power

• Black: Chassis ground

• Brown: CAN-

• Green: CAN+

• Blue: 5V legacy output for JB4

VEHICLE FITMENT (S63TU Engine)

BMW M5

• 2012–2016 F10 M5

• 2017–2023 F90 M5

• 2023+ G9X M5

BMW M6

• 2012–2019 F12 M6

• 2012–2019 F13 M6

• 2012–2019 F06 M6

BMW M8

• 2019+ F91 M8

• 2019+ F92 M8

• 2019+ F93 M8

BMW X5M

• 2015–2018 F85 X5M

• 2019+ F95 X5M

BMW X6M

• 2015–2019 F86 X6M

• 2020+ G06 X6M

BMW 760iX

• 2022+ G7X 760iX

This flex fuel kit provides the accuracy, reliability, and seamless integration needed to safely maximize performance on any S63TU-powered BMW running ethanol blends.