Sorry, it has taken so long to re-post on this thread. I was out of town for a few days. So, Jcat, I did some more diagnostics with the fuel pressure gauge while driving. I did tape the gauge to the window and went for a drive so you can see what I am seeing and see if you can shed any light no this. The fuel pressure is holding solid at 45 psi in the on position and while running. I unplugged the fuel pressure regulator line and there was no fuel in the hose. The PSI did go up to 52 psi while running. My brother has the same motor, but on a 2005 GMC 2500. His fuel pressure is at 63 psi while running, but he does not have a flex fuel like I have. Someone mentioned in another forum that the fuel pressure should be between 42 psi and 48 psi with flex fuel engines. I do not have a Chilton to confirm this spec. In the video's the fuel pressure will only move when I step on the gas or take my foot off the gas pedal. It will not move when my rpm's bounce at 1800 and 2000. So, I took three video's while driving, and here they are. Please help...
Part 1-
http://youtu.be/8_P9-zY2XuM
Part 2-
http://youtu.be/qVagof6rEoI
Part 3-
http://youtu.be/y65zDlvmH3U