| So no codes are showing up? Have you tried the self test procedure?
If you can access the fuel pump itself, give it a few good whacks on the outside. Believe it or not, this can often get it to at least start for a bit - and that would definitely show you where the fault is.
How many miles do you have on the O2 sensor? You might try checking the plugs to see what kind of condition they're in. Also, check the vacuum lines to see if there are any cracked or damaged ones. That's all I can think of right now.... | 
