My z has been giving me problems for a while now ever since I ran it out of gas one day and now sometimes it starts and runs for awhile but most of the time it only cranks. I just rented a fuel pressure guage and the pressure after the fuel filter reads 50 psi and I also checked the return line and its only at 10psi. Is this normal? Im just trying to figure out why it isnt starting all the time. If someone could help me out i'd appreciate it I really dont want to sell the car