It's a catch .22. The pump has to have oil in it before it can pump oil. Once it's full, you'll have pressure as you spin it with the drill.
Try this... Remove the 1" nut spring and valve. Try and find a hose (clear would be best) that will seal up in place of the 1" nut and rig up a funnel to pour oil in there. With the valve removed you should be able to get oil inside the pump cavity. Spin the pump backward by hand and see if it pulls the oil in. If you can get it to draw oil and fill up the pipe, you're primed.
Caveat above^^ that plan is based on theory. I've never owned a hotair and my pumps self prime so I've never had to use that idea. I just looked at a timing cover in my living room and oil will go straight into the pump if you remove the valve, so I believe it to be sound.
Try this... Remove the 1" nut spring and valve. Try and find a hose (clear would be best) that will seal up in place of the 1" nut and rig up a funnel to pour oil in there. With the valve removed you should be able to get oil inside the pump cavity. Spin the pump backward by hand and see if it pulls the oil in. If you can get it to draw oil and fill up the pipe, you're primed.
Caveat above^^ that plan is based on theory. I've never owned a hotair and my pumps self prime so I've never had to use that idea. I just looked at a timing cover in my living room and oil will go straight into the pump if you remove the valve, so I believe it to be sound.