I have a cps on order to address a warm crank/no start (only happened a few times ) but also wanted to check the fuel pressure to check the state of the fuel pump and had some funny results. I am reading no pressure with the ignition on but as soon as I crank it jumps to 48 and holds there while the car runs. Should I be seeing pressure with the ignition "on" ? When i turn the engine off the pressure holds around 45 but I have not left the gauge on for long. Is this normal or any suggestions on further diagnosis ?