replaced oil line

I have a 04 yamaha two stroke 40hp that i replaced the oil line on. It goes from the bottom of the tank around the outside then back to the top where it hits a permanent tube built in to the tank. then runs out the other side down to the injectors. After I replacing it there is air in the line above the oil line in the tank. I turned the motor over and ran it for 3 or 4 minutes and the oil did not rise at all in the line. How do I go about purging out this air to create a vacuum again?