Ok this is the problem I am experiencing and before I just start replacing parts I thought someone would have an idea or two of what is could be. My guess is the electric fuel pump.

Ramcharger sometimes starts right up and runs. It will run fine until I shut it off. If I restart within 3-5 minutes it usually starts up fine. If I wait 10-15 minutes then its a high probability she will not start. If turns over and acts like she wants to start but will die quickly then after a few attempts it will just crank. If I then let her sit until cold sometimes she will start right away other times she will just turn over. OK any help on this one?