30AB-JK
I believe that the Scavange Pump operates automatically when the CWT fuel level reaches a low level (can't remember the exact figure, but around 900-1500kg). It cannot be switched on and therefore cannot be used to remove the fuel.
From memory (I no longer have the manuals), if both the CWT pumps fail then the fuel is unuseable. Perhaps a currect 744 pilot could confirm?
Dave