2000 Jeep Wrangler smell gas and long start up

I notice the smell of gas after I shut off the vehicle, there does not appear to be a leak I can find. It now takes longer to start. These are the steps I have taken- turn the key on ten seconds then turn off and back on again and it starts right up. I iused a scanner and the code came up as fuel evap system leak ( large ). I tested the pressure and after the key is turned off it slowly drops pressure. I saw this post prior and it is the same problem that I am having but I could not find the solution--- Recently my Jeep has started taking considerably longer to start, it turns over for 15 seconds or more. When it finally starts it chugs and runs rough for a minute, almost as if it isn't getting enough fuel. Upon starting there is a smell of gas inside the cab. There are no visible leaks on the gound and there is no hesitstion of power at any speed. A friend of mine stated he thought it may be a fuel pump or an injector. How do I find out for sure? Any help would be appreciated. Thanks