Yep, the manual has this...there is a bleed zerk nipple on pump. Once the reservoir has been filled, open zerk to let out air (when oil comes out clear, close zerk). You do not want to be running your pump on air.... The pump takes oil from reservoir...it is important to keep that full to sight glass. Although, I've heard of one guy who has done so, to empty as much hyd fluid as possible during an oil change...