Thanks. I looked at the dip stick to note that I was a bit low. It is pretty hard to effectively read the dip stick, since getting it in and out is awkward at best, and that could certainly affect the reading.
I put in about 3 caps of oil into the fill area, and it seems like the level is good (or as good as one is able to determine).
I would certainly recommend that the injection pump level be checked periodically, as a failed injection pump is likely a pretty dear repair.