Not hackin on you Dave, just discussing, I wonder why you wouldn't want to drain it, too difficult or? Take the feeder line from the tank, hook it to a cheap 12 volt fuel pump and drain it into jerry cans for your vehicle. Then add a good dose of Seafoam to the tank before closing it. All my gas engines are stored dry, my oldest is a 47 year old snowblower, not quite the same as in inboard, but the principles the same. I think it would be easier, JMHO.