As far as I can tell, this pump is identical to mine:
http://shop.startermotorsalternators...p#.UXwGQMp1mb4
I guess that's rotary type. I have a manual showing the pump, mine is the first type in this document, the CAV hydralically Governed DPA starting on page 11. The PDF file is too big to upload as an attachment, so I've uploaded it to a webserver at this address:
http://superbum.org/Bedford_330_Fuel_and_exhaust.PDF
This pump has two bleeding screws, see page 11, one on the pump body and one on the top of the governor. As usual, one bleeds the lower one first and then finishes with the one on the top/governor. I can reach and see the pump on the left side, but can't see the right side. I can only reach the pump with my left arm, so in-depth inspection is difficult.
I can reach the 3 or 4 injector pipes from the rear, the front ones are out of range. I have tried to open them and crank, and as mentioned above, I don't get the proper "burst" of fuel I'm used to seeing when venting injection pipes, it's more of a weak trickle.