Energy
Sufficient to collapse tanks and Fuel Lines would "Boil" the lights out of the Fuel, not to mention have to be serendipitously synchronized to each "side": they responded, initially (read: simultaneously). The lobes on the pump were Deformed, Pitted (Cavitation). My theory on the "damage" reported by Boeing and AAIB #2. Are we overlooking some rather obvious available energy that can boil some liquids at a fair distance? The vibration and acoustics from 180,000 pounds of thrust made by two 10 foot fans at full go. A closed system, Fuel with no gas present, can be made to vaporize without any mechanical prodding, just vibration and or sound energy. I know, why hasn't it happened before?.
Airfoil