I am a new boat owner. I have a Bayliner 2002 1954 with a MerCruiser Alpha 1 3.0 IL4. This motor is equipped with the quick drain hose that you pull through the bilge drain to drain the oil. Problem is, when I open the drain plug on the hose, nothing comes out. My dipstick shows a full crankcase. I pulled off the oil cap, pulled the dipstick out, and loosened up the oil filter to allow positive air return, but still no oil drains out. The hose is not kinked and is pulled straight out the bilge drain. Is there something I am missing? I don't want to revert to pumping the oil out the dipstick as the pump needed costs $50!