On my others I just squeeze the bottle and hold for a 3 or 4 count. This one, I have to pump the bottle a few time,s then the juice will start to come up. The end of the tube is clear of the bottom of the bottle, I ran water thru the top of the connector, and thru the tube via a needle and syringe, and that is clear. Would this have to do with the bottle not seating correctly against the o-ring in the cap?