wont start

What is your question?

my yukon will only crank will not turn over so i replaced the fuel filter and it started right up so i let it run for about 15 min then i shut it off then tried to start it back up it started to just crank again but not turn over so i poured fuel down the throttle and it started back up but then died when i gave it to much gas now im back at square 1 again i dont think its the fuel pump becuase i can here it turn on does anyone know what it could be