Thanks RJ, We just slammed the door and left the shop for awhile. couldn't get the gas selector off the shaft. Had to tip the tank enough we could get to the petcock nut. finally got it off tank. Been so long since I worked on the bike, I forgot everything I thought I knew about it-don't remember having to take the selector shaft off to move the tank but it's under the frame, so I must have....Sucking air on the vacuum port seems to do nothing but give me gas smelling/tasting(no liquid) air. Was it leaking thru a busted vacuum diaphram?
Did ya remove the little phillips head screw in the center of the selector?