[Dave S.]

When I had to pump the gas out of my tank on other vehicles I was restoring I was able to run a hose off the fuel pump to a gas can to let it run the tank dry. Of course you have to shut it off as the tank empties out or risk damaging the pump. In one case I bought a cheap aftermarket fuel pump designed to use outside of the tank at checkers and added some alligator clips and wires to hook it up to the battery and pump the gas out. Not sure how easy or hard this would be on a Boxster, but from one of the earlier posts it sounds like the pump is fairly accessable under the battery.
Not sure how you are going to dispose of all that bad gas though.