The only pump is the injection pump. What is the "feeedpump"?
In the US, the fuel filter and sedimenter are together. Is yours separate?
the feedpump is the internal component of the IP i guess..
sort of circular thing, dont really know how it works, but my friends isuzu car, when they go to injector specialist, the store usually replace that thing..
the official diagram is in here : http://catalog.isuzuastraparts.com/
but the web is kinda error-ish.. sometimes it works, sometimes its not..
this is the screen shot : http://cdn-u.kaskus.us/57/xt25eeee.jpg
i know maybe you will say, it is for 4JA1 engine,
but if you have any luck goin inside the web, you can select the PICKUP which has the diagram for the C223 engine.. which i dont have access to it the last 2 days.. dont know why..
right joe.. they are seperated.. i'll post later the pic today, yesterday i forgot to take the pictures..