Congratulations on your purchase of the COBB Tuning Flex Fuel kit! The following instructions will assist you through the installation process. Please read them BEFORE beginning the install to familiarize yourself with the steps and tools needed. If you feel you cannot properly perform this installation, we HIGHLY recommend you take the vehicle to a qualified and experienced automotive technician.
IMPORTANT! Installing this kit will require custom tuning or utilizing an appropriate Stage Power Package map if you have a matching mechanical configuration. Please consult with COBB or an authorized ProTuner in your area.
Part List
Tools Needed
Important! Before removing your fuel line, make sure to discharge existing fuel pressure from the system. Failure to do so can result in fire, property damage, and/or death!
This can be the most difficult portion of the install! Please take your time to avoid cross-threading the fuse box bolt
Installation of COBB Flex Fuel Kit Hoses
The COBB Flex Fuel Sensor installs in the new feed line between the manifold connector and the firewall.
The COBB Flex Fuel Module is designed to be bolted manifold and plugged into the COBB Ethanol Sensor, in-line with the factory Rear O2 sensor and Tumble Generator Valve (TGV).
The Rear O2 connector obtains 12V power, and does not alter the O2 sensor signal going to the ECU. The TGV connection allows the motor signals to pass through for those still using the factory TGV's, however the feedback normally used to check TGV position is used to transmit Ethanol content data to the ECU (Engine Control Unit). Mounting location may vary by customer/ installer preference, however it is recommended to seal any un-used connections from water intrusion, ideally by using the proper connector mate and using plugs to seal the mating connector. |
Ethanol Sensor Input Selection = TGV Left
Sensor calibration:
0.5 V = 0% Ethanol
4.5 V = 100% Ethanol
COBB Product Install Instructions for Subaru Vehicles
Main Installation Instruction Repository for Subaru Parts
Calibration Map Notes for Subaru Vehicles
Link to Subaru Map Notes to see what map you should be on given the parts you've added
COBB Flex Fuel Troubleshooting: Subaru