In need of a smart car person to answer question?
Thanks for the edit, and yeah it does have something to do with the fuel system, did you try replacing the relay?
Here's what you do, next time you start it, when you turn the key, try listening for a whirring noise right before the car cranks, if you can't hear it, get someone else to listen for it, or get them to turn the key. If you CAN'T hear a whirring noise, your fuel pump is not pumping fuel, if you do hear a whirring noise, then the fuel pump is fine.
Another thing, PCM stands for Power train Control Module. If you replaced that fuse, and it started up and died, it most likely does go to the PCM, and you should try replacing that fuse with the correct fuse (Try putting a fuse that is of the same voltage as the original or a fuse that has a higher voltage value than the original.)
Also, since the theft light is on, maybe some one was trying to siphon the gas?