"Is the metering rod under the cover on the top with the 3 screws. I believe its the governor cover." The metering VALVE IS under that cover. CAREFUL... if you don't get it back on correctly, you can jam the mechanism, so the engine will "run away" AND won't shut down. "Can I use a carb Cleaner or similar?" I wouldn't use anything but CLEAN diesel fuel to loosen up any gummy parts. "With the pressures that the pump can generate my guess is that the fuel is just not getting to the pump pistons. The Return line is a little wet. But thats in a static state, not running."
Try removing the complete return line fitting from the pump cover, and cranking the engine. If the (vane) transfer pump is working, you should have fuel PUMPING out the hole, REGARDLESS as to if the metering valve or high-pressure pistons are stuck. (The return fitting can get blocked with "coffee groubds" IF the plastic governor ring in the pump has deteriorated.) "Is there any good pointers on the web for additional info?" I don't know of any "public access" sites with detailed Roosa-Master pump information. "Also what looks like a drain plug or bleeder screw in the bottom of the the pump. Is it safe to remove?"
I'm NOT exactly sure of which plug you are referring to. I suggest you err on the side of caution, and leave it alone. If you want to spend the $$$, you can get an injection service manual from Deere, by calling 1-800-522-7448. Occasionally, they come up on ebay. There are IH Blue Ribbon Service Manuals for injection pumps, as well, and the information is pretty much the same. One of those MAY be easier to find, and less $$$.
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