My truck died I tried both tanks to start, no luck. Finally started after about 5 minutes. It did this about 5 times. I starting carrying a fuel pressure gauge with me and it never did it again for a year. The day after I took the fuel gauge out while cleaning the truck it did it again. I did get it started and back home. It was in a no start condition once parked at home. Checked the fuel pressure and it was barely above 20 lbs. The front sending unit had stopped working about a year ago. I decided I couldn't go wrong replacing the fuel delivery unit in the front tank. Still will not start, gauge works through. Little victories. I can hear the pumps prime and I am now getting 40 lbs. When I release the pressure with the gauge, gas comes out. then the pressure slowly rises after I release the pressure button. I pulled codes and I only get 33 and 133 i think. 33 is EGR Valve open and I cannot find anything for 133. Maybe I read the codes wrong. I tried it twice and got the same codes. Does anyone have any ideas.