93 would not start one morning when I went to leave for work.I pushed in on the shraeder on the fuel rail and didnt see any fuel ,I tried to listen to the fuel pump could not hear it checked the relay it seemed to work.I ordered a fuel pump and filter installed them I can hear the new pump work but still no start, pulled a spark plug the plug was dry and had spark when I turned the engine over. any body have a idea on what to check next? cel code 512 & 231