I personaly would put a feul pressure gauge on it and see what you are getting . you could be getting some feul but not enough pressure to run it . I had this problem just the other day when trying to get my truck running after sitting for a while .
try this. rotate the key to the start possition severl times with out trying to start . after doing this say 5-10 times then try to start it . if it starts it will be a feul pressure problem . it should start and run for a little while then die once you try to give it a lilttle gas . or just die out once it uses up the feul pressure .