I highlighted the wiring for the injection system power supply. You mentioned checking the fuel EFI relay. Did you also check the circuit open relay? Are fuses good? Is there power to the black wire with a white tracer to each fuel injector? All should have power with the key on or in the start position.
Pic 1 below shows the power distribution related to the relays. Take a look at it and let me know if the things highlighted have been checked.
Also, if possible, let me know if you have spark to the plugs. The easiest way to check is to simply see if it starts for a few seconds using starting fluid.
Let me know.
Friday, December 17th, 2021 AT 4:22 PM