I have a 2001 F250, 7.3, I have upgraded to level 3 on the hypertech (which required no alterations to original equipment). I was towing my 12,000 lb trailer, on a moderate incline, with heavy acceleration, at which point the service engine soon light came on. It reset itself later on in the trip, before my destination. I drove home without any problems, the light did not come back on, the engine performed flawlessly. After I got home, I checked the code, which revealed P1211. Tech listing shows it to be a fuel pressure related issue. Can anyone explain this better, do I need to do anything to correct this issue so I do not have any further trouble with it, or was it a momentary glitch in the system?