Yeah, this particular reservoir was thought-out poorly, as the inlet for the reservoir has an internal tube attached that practically feeds straight back into the pump's inlet. You could take a few inches of tubing of suitable length to reach from the fill-port to between the pump inlet and reservoir inlet tube (you want this long enough so you can easily remove it later) then cut it in half (length ways). Insert the length ways cut tubing between the reservoir's inlet tube and pump's top inlet, run loop to bleed, top off with water, and repeat till sufficiently bleed of air. When done remove tubing and you should be good to go.
I would keep the cut-tubing somewhere for any future draining and refilling needs.
