Overtalk, Belgique,
I think you may have misunderstood the AD and the shorting problem.
It would not be possible for a short in the pump itself to cause the pump to run dry. Because when the pump is switched off, the 3 phase power to the pump is switched off (NOT the earth) via a relay.
For the pump to run dry would require either a failure of the 3 phase relay, or for the crew to forget to switch the pumps off.
As for fuel jettison it is only necessary to dump fuel such that the a/c is below MLW not ALL the fuel.