could be either the fuel filter is clogged or the fuel pump went out in it.if your doing it yourself,first i'd look into the fuel filter.if it doesn't have a bunch of stuff in it then while its off turn the key to the on position but don't start it.the fuel pump should kick on and gas will come out of the line.if not the fuel pump is bad.if it does though and the fuel filter looks ok then you've got a problem somewhere else.