As far as I am concerned, all NGs should run one AC fuel pump whenever the APU is running.
The APU has an internal DC fuel pump, but that is designed only for starting the APU on the battery, not for continuous use, otherwise it will fail over time.
The pressure supplied by any AC pump will override and stop the DC pump!
For me, LHS AC pump normally, RHS (with Xfeed valve open) when balance is needed, but with CWT fuel I use one of those pumps (when CWT fuel quantity is sufficient), that way I don't get any balance problems.
Cheers,
EW73