in hot weather and truck has set for a while hard to start
 

2001 silverado 325 ci motor 90k miles runs great otherwise. I have to cycle ignition three times before it will start.I have not checked fuel pressure to see how fast it bleeds off. Replaced pressure regulator because it was a cheap and easy fix,but it did not fix. So its down to injectors or fuel pump. Tried a bottle of injector cleaner in fuel tank with no luck. guess my next stab will be order new fuel pump and replace?