my 1992 chevy s10 v6 2.8 engine

my car broke down recently , it will crank but not run, a friend took a look at it and put gas directly into the caberator i turned the key then the car sounded like at wanted to start , then the losened the "main" fuel line and told me that if i turn the key fuel should come out , i turned the key and nothing .. so he figured it was the fuel pump and or fuel filter , i went and bought both and changed the fuel pump and fuel filter, but still nothing , i then bought one fuel pump relay switch , there looks like theirs two of them but i bought one ,, but when i replaced the fuel pump relay the car still cranked up but did not start at all ,, what else can be the problem??