Last week I got an Edge CTS (gauges only). I made a run from East Texas to just west of Oklahoma City carrying a 12' dia. fiberglass tank and a "Doghouse" (a Morgan Building 10'6" by 16' by 10' high) not really any weight. The questions are what should my readings be on the fuel rail pressure at WOT. The highest I saw was 20.5, I assume that is 20,500 psi. My manifold pressure was up to 25 lbs and my transmission fluid was 170 - 180. The hottest my water temp got was around 210, at this point I haven't gotten a egt gauge and with my water temp staying as low as it is I don't believe I will. The water temp would be much higher if the head was getting hot. The question I have is I didn't seem to have any power going into the wind and when climbing a hill. The fastest I could go was 50 - 55 mph (into a 30 mph wind) with the truck floor-boarded, this was in 4th gear (direct?) I don't believe I am getting the fuel pressure I should. I do have some fuel related codes, p0148, p0087, p0487 and also p2141. I know that someone is going to say pressure relief valve has let go but it is capped, so that is not the problem, it has been capped for the past 75,000 miles.
Any comments?

 

Apparently no interest in this post, but for what it's worth I found that it was a combination of the load and wind that was causing the lack of power problem. I ran the CTS on a friends identical truck and was getting nearly the same fuel rail pressure readings. Everything is running fine and I went over 400,000 miles this week. This has been a good truck.