The fuel pump relay is controlled by the ECU. It's the ECU that tells it when to kick on and off.
Not sure on where to get a write-up but if you have a multimeter, you're golden. I believe from what I can remember from 4-5 years ago when I was doing something similar, the injector power wire is a white/black wire. Don't quote me on that but if you have a wiring diagram of any kind, you'll be able to tell what wire is which.