Just throwing out this info, I managed to repair my Apexi power fc ecu. It stopped controlling the fuel pump, the repair was easy it involved desodering and soldering in a new switching transistor.
The transistor will blow if you have a fuel pump relay without a loopback diode or incorrectly wired relay (pin 85 is GND)

The transistor will blow if you have a fuel pump relay without a loopback diode or incorrectly wired relay (pin 85 is GND)

