engine cranks through cycle, won't start, try to start again and the engine starts right up, what would cause this problem

Hello, how did you measure fuel pressure? Did you use a fuel pressure gauge at the fuel rail of the engine? That is what is needed. If you have low fuel pressure, the fuel cap has nothing to do with it. A fuel pump concern could be present, a regulator could be a concern. But first a valid test must be performed. Because your concern could be caused by many other things other than fuel pressure loss. www.repairpal.com/repair-shops