I flew the SA 226 and 227 (metroliner) about 20 years ago. It was a POS then and I am sure it is even worse now.
Yes, it is a cross-flow system and not a cross feed system. Another POS idea if you ask me.
That the pilot could and did execute two 360degree turns in opposite directions (verified by radar track) tells me that it should have had the capacity to land under full control right away. Of course the pilot ( solo, in pax ops we had two pilots) may have been trying to "fix things" and continue on rather than risk firing by his employers.
IT IS interesting to note that pieces of prop found away from main crash site. I do recall one scenario near fresno, ca when one of our planes had a prop break apart in flight, causing the engine to "cant" in its mount. plane was virtually unflyable at speeds below 200+ knots...miracle happend to be that plane was in cruise, all lined up with KFAT airport main runway...they landed safely.
even if all the fuel migrated to the opposite wing, causing flame out in "lighter wing" engine, the plane might have been controllable.
thanks for posting this crash info.
regards
jon