Rebuilding A Mechanical Fuel Pump Part 1 | How Do I Take This Apart?

It took a while, but I'm finally working on the truck again. I got the truck running, but fuel was leaking out of the fuel pump. I knew next to nothing about how this fuel pump works going into it, but I figure the best way to learn is by rebuilding it. Of course, the first thing I need to figure out is how to take the thing apart.