QRH/ECAM etc. aside, with the pump setup as presented by Hossein I'd still expect fuel to be drawn from the LH tank...
What am I missing? Would there be any reason the remaining pump on the RH side had higher output pressure than the LH wing pumps?
As a side note, I've seen this happen to a CTR pump once. With Center tank in use we noticed a developing unbalance and eventually traced it down to LH CTR pump having lower output pressure than the corresponding wing pumps. There was no 'LO
PR' fault, but the center fuel obviously didn't feed the LH engine.
Applying the "fuel auto feed fault" ECAM procedure didn't solve the issue. We eventually switched off the faulty pump and opened x-feed to enable the other CTR pump feed both sides...*
*After careful checking for possible leak