02 Chevy Cavalier 2.2 OHV

this car recently started having issues, The car would crank and run fine til it warmed up, but when turned off after driving the fuel pump would not engage, after sitting and cooling off, the fuel pump would hum and the car would crank and run like a champ. now nothing. I have put a new pump on last Feb, and just put a new one on 3 days ago and it ran fine to the house Thurs. Jan 17,2013, but when i got home and turned the car off, it wouldn't start hummimg. Friday morning Jan.18,2013 the car started and when it got warm 180 Degrees, the car died and won't start back. I replaced the Ignition control module at a cost of $200 and it still won't start?? is there something I am missing??? new relays and all replaced?? the car turns over but the fuel pump does not hum? any suggestions would be helpful?!