****Updated for Resolution Post #20****
We installed a forged LT4 and blower into a 2019 C7 GS and I'm having a problem with the system regulating pressure correctly. I've checked everything and had the blower on and off several times. I'm using the HPFP Tables from a 2019 Z06, and also tried the stock tables with the same result. It's showing 2-4x the desired pressure at idle, and when I blipped the throttle the engine ran away and the pressure hit 28000kpa. I had to key it off to stop it. The engine was a swap from a wrecked car, so I'm not ruling out a bad pump. This is a startup file based on a few of these conversions I've done in the past. The lifter for the pump is from an LT1 if that makes a difference.
I did notice that if I sweep the throttle pedal with the KOEO I can hear the aux pump run.
Fuel System:
LT4 injectors
LT4 HPFP w/LS7 lash cap
38% cam lobe
LT1 Low Side
DSX Aux Fuel Pump
In terms of the harness, I've checked to make sure the HPFP is hooked up and pinned into the main harness correctly. I read somewhere that the 2019 Harness is different between an LT1 and LT4, but going through the pins and checking everything showed the connections were correct.
Looking at the attached tune file and log, can anyone tell me if I'm missing something? I'm planning to swap the LT1 HPFP back in to Diag, but surely someone has seen this before.
Also codes: P0089, P228D