I dont know of a procedure, and I've never had to do it to any of my ragtops, but I'd say if you hook up the hoses to the pump, then run the pump to fill up the hoses before you hook them up to the lift cylinders to get the air out of the lines, you'd be good. look on the lift cylinders and see if there is some type of bleeder at the top of the cylinder. Maybe someone else has done this and knows a trick. If no-one else chimes in, i'll take a look at my 70 FSM and see if they have a procedure for this.