Been having this problem for a while. I changed the fuel pump recently but it didn't fix the problem... When i start the car i always have to give it a quick crank, turn the key off then crank again and it starts. Feels like i'm priming the pump/lines. I added a fuel line pressure gauge and noticed that the pressure goes up to around 50 psi when you turn the ignition on and then starts dropping, like the fuel pump disengages so i have to turn the key completely off and then on again to crank the second time and it fires up. Any ideas what it could be? Also had the injectors all serviced at a reputable shop.