From memory on the classic the take-off fuel configuration was "H" ie. #1 and #4 crossfeed valves open and #2 and #3 valves closed. With no centre tank fuel then this was "tank to engine" however with centre tank fuel it would feed the outboard engines thereby helping wing bending relief since the outboard tanks would stay full since the CWT pumps had a higher pressure to overcome the #1 and #4 tank pumps which acted as backup in the event of CWT failure.
After the aircraft was clean then the centre wing tank pumps would feed all engines.