On the first A320 aircraft one of the servicing panels was at the front FWD and below the LH FWD main entry door.......one night i went out to fix a dump valve that was leaking after a lot of flushing and cleaning we got it to seal and with no more leakage evident after 4 hours i put pen to paper and let the thing go flying with the results posted above.
I suspect that these aircraft were the last to be fitted with the indivdual tanks and due to a change in heath and safety regulations all aircraft now have the air driven waist system.