What determines Fuel Pressure Desired?

[EverydayDiesel]

Hello,

I am trying to trouble shoot why my truck wants to idle at 8k. I have basically a stock tune converted to a single event and deletes. I noticed today that the ECM is commanding the pumps to raise the rail pressure to 8k (log attached).

Any help you can give me is greatly appreciated!

[enew0]

Could the ECM be thinking the Pedal Position is at a different point or at 0% throttle you're asking for more fuel which pushes you to 8k?

[2007 5.9]

Ecm requires more mm3 to maintain idle quality, thus pushing your rail up