2000 cavalier wont start

Hi anyone who has any advise!!! I have a 2000 Chevy Cavalier 2.2 motor. For some reason it will not start. We started the car and then went up in a driveway that was like a hill, then shut the car off. Then when we tried to crank it again it would turn over but will not crank. So many people have looked at it and thought it was the fuel pump but we replaced it and it is still doing the same thing. It acts like it wants to crank but isnt getting any gas. We also put a new relay on it and that didnt work. We are out of ideas. Someone has suggested a map sensor but we havnt got that yet. Please any info would be greatly appreciated!!! Even guesses!!!!! Thanks
Tracy