Yanmar fuel injector pump

[Windblown]

I just changed the oil in my 4JH2-HTE, and noticed a second oil fill cap on the fuel injector pump. Looking inside, there does not appear to be any oil in it. I can see the drive gear, and all the way to the bottom. This is after I filled the crankcase with new oil. Is this a separate reservoir from the engine crankcase, and should I just put the same oil in it? I can't find anything in my service manual about it. It also has no dipstick, or oil level mark I can see, so I don't know how much to put in.
Any ideas?

[Bohemian17]

It's just another place to pour in oil oil is delivered to your injection pump from the line that runs along the side of your block from the rear I can't figure out why they did that either

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