You *really* need to get into the software to understand what is going on.
What codes are causing the "engine light" (correctly called Malfunction Indicator Lamp or MIL for short)?
What is the fuel pressure when cranking?
With the Jeep Diag Pro you can see these. I can't overstate how much it helps to diagnose.
Having had the system open, what have you done to evacuate the air?
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