I'm not sure what to put power to without actually removing the fuel tank to get to the pump. You can't access the pump unless you drop the tank, The best I could think of would be that plug under the rear seat, and I think part of those wires are for the sending unit too.
My first thought was that it had to be a bad pump- but after it starts it will run all day and be fine.. for example, yesterday I was leaving for Import-FaceOff at 9am. It was like 40 degree's out and it wouldn't start. After messing with stuff for 15 minutes it finally activates the fuel pump. I drove the 50 miles or whatever it is to the racetrack.. parked it in 85 degree sun for the next 6-7 hours.. then got in, it started right up and drove home no problems.