. Test all under hood and under dash fuses with a test light or multimeter:
https://www.askmehelpdesk.com/cars-t...tml#post252145
. Check for codes.
. Check for spark.
. Correct the fuel pump wiring. Hard wiring the fuel pump is a fireball waiting to happen, if you're in an accident. Focus on the fuel pump fuse and the fuel pump relay. The fuel rail needs to be fully pressurized, before the engine will start. I recommend correcting the fuel system to how it was originally. I can see where the ECM could have a major problem with the current configuration and prevent the engine from starting.