It's very hard to describe the bleeding process in a meaningful way unless you understand there are two sections of the fuel system - the low pressure feed side and the high pressure (injector) side. If you want to learn about this, and how the bleed the air from a motor I suggest you really need to read a basic book about marine diesel engines. Do yourself a favor and get Nigel Calder's book (or something like it) and read the pages on bleeding air from a fuel system.