trying too help a friend on there lumina. the car cranks but doesn't start. i pushed the bleeder on the fuel rail and got nothing. i do not here the fuel pump running. someone in the past cut the floor so i can actually get too the fuel pump with the tank in. i checked power too the pump and i got 12 volts to the gray wire and 8 volts too the purple wire. i don't have a wiring diagram too know what is normal. any help is appreciated.