The failsafe coming on has no cause for the kit not spraying, it's a secondary factor of the kit not spraying.

Did the jets spray strong when the the SYS jumper was linked in testing? You should have seen a few flow bars and set the SC to 6-7 bars at this time.

Then the green LED should be flashing with the FI pulse. Turn the THRES to minimum, and drive the car and the system should inject, with the yellow LED coming on in the controller when the kit injects.

Is this s DI car and was the proper schematic used and links on the board cut and soldered?