In order to allay any fears by those unfamiliar with this problem (on the B747):
1. It is not new.
2. The requirement is to keep the override/jettison pumps (booster pumps by another name) covered with fuel. That keeps them cool and excludes air & fuel vapour.
3. All the fuel in the centre tank may be used. When the contents reach a pre-determined minimum level, the main pumps are switched off and the centre tank emptied into number 2 tank by the scavenge pump which is not affected by the problem.
(so the bad boys can still arrive with sod all fuel but comply with AD 2002-19-52
)