"For take off the engines are fed by their respective wing tanks, shortly after take off fuel is fed to all engines from the centre wing tank."
I think you'll find that with fuel in the CWT(Center Wing Tank) and flaps extended for takeoff and initial climb, the CWT will feed the #1 and #4 engines and the inboard wing tanks will feed their respective (#2 and #3) engines. With flaps up, the CWT feeds all engines until, as you say, the CWT quantity reaches the point where fuel can be transferred from the HST (Horizontal Stabilizer Tank).
The HST holds about 3,300 US Gallons (22,110lbs / 12,492litres / 10,029Kg).
Rgds.
NSEU.