Engine not starting up?

Last week I was warming up my truck since it was really cold, it was about minus 15F and after ten minutes of my truck idling it just suddenly shut off. After that it would not start, then the next day I started trouble shooting it. Once I pushed it in my garage, the next thing I did was I checked my fuel pump; it seemed to be working fine since I could hear it humming. I also checked fuel pump fuses and relays, they also seemed to be fine. Also I checked the fuel pump pressure, it gave me 55 psi, I do not know if that is the correct measurement for the pressure to be at though. Another thing I checked was my crank and my cam sensors; they both have resistance, I just do not know about the required readings. I also tried using starter fluid and l had no luck. Lastly, I removed my intake plenum and replaced the gaskets, thinking it might be a vacuum leak, but when I removed my intake plenum, I noticed that three valve chambers on one side were flooded with gasoline, so After I was done with the gaskets I tried to fire it up and it did not start. I am running out of options, I do not know if I need to check my pressure regulator or not. If you could provide me with any tips on some specs on fuel pump pressure, crank and cam resistance and any other things I should check I would really appreciate it. I am sorry for the really long paragraph by the way, I wanted to provide you with as much information as possible. Also, No trouble codes.