I wasnt sure if a diaphram with a hole in it would cause a check engine light or not. I was also thinking maybe I am getting a weak fuel pump, and the cold is affecting it. A question: Are those fuel pumps inline pumps along the frame, or mounted in the tank? I am praying the buzzing sound I heard from underneath on the frame rail was the pump..lol. Also, is there a check ball or valve between the regulator and the pump, maybe in front of the pump directly? I really need to buy a CD shop manual..lol. I am going to check the schrader valve on the fuel rail (cannot locate my fuel pressure gauge), and just see if I have any spray, or if it feebly leaks out.