Bob - That fuel shutoff is per AYBC standards.

Instead of acetone, try pumping good fuel back into the tank using a small pump. Disconnect the hose from the engine side and connect it to the small pump discharge. Then pump about a gallon of clean fuel to get the sludge out of the pickup tube. Once that is done, use a flexible hose and small pump to get as much stuff out of the tank from the inspection port. Mark Rotsky on Nemesis gave me this tip.