I have a 2004 Altima 2.5s. If the car sits from 5 to 60 minutes it cranks for about 6 seconds before it starts, but if it sits 1 hr or longer it will start fine. I don't think it's the fuel pressure regulator because it would always have a long crank. Also don't think it's the purge valve because I pinched the hose before the valve & I still had the long crank before it would start. Would could be the problem?