15-03-2013, 05:56
It could be many things, defective hand pump (happens), crack in the dome, hole in the tubing, etc. etc. To test it, try pumping on your butt or tummy like doodlebug suggested. If you don't get suction, detach the pump, put the dome on your tummy, suck the air out with your mouth on the tubing, if you still don't get suction, check the dome and the tubing for cracks or holes.