Is there anything in the tune we need to update? I have an LT1 car and I copied the fuel pump data from a Z06. I'm not getting any extra high side fuel pressure. I tried another LT4 pump and it's the same thing. It's plugged in for sure but the fuel rail pressure is about the same as the low pressure side. We checked to make sure it's plugged in, the car ran fine with the LT1 stuff in it the day before. Can't be in the tune can it?