CWT pumps
My thoughts are that as soon as it is obvious that the pumps have begun to cavitate, if there is not an AUTO-OFF function, turn them OFF. The pumps depend on the fuel for cooling and lubrication and nothing is gained by running them when the fuel is so low as to be unable to be picked up sufficiently to maintain constant pressure. BTW, it is not just the centre wing pumps which should not be run without fuel.