You might find some clues in your MEL.
For dispatching with one CWT pump inop ours states:
1. With center tank fueled.
A. Center tank fuel must be included as part of Zero Fuel Weight
B. If remaining center tank pump fails at any time, remaining fuel quantity in main wing tanks must be adequate to reach a suitable airport.
With two inop:
May be inoperative deactivated provided:
a) Center tank fuel is included as part of
Zero Fuel Weight, and
b) Center tank fuel is considered unusable
In short, with two inop cwt fuel is unusable.