If you don't have one create an account on the Cummins Quickserve site.
They've changed the way you have to create an account so you will have to work through it, you may have to call them.
But it is worth it. The site will enable you get a lot of information on your engine including parts, maintenance, and trouble shooting guides.
You can see the fuel system and see if you do have a lift pump, I am not sure, at some point Cummins abandoned the CAPS pump.