Hi - checking fuel usage 6 hours into a ~8 hour flight, and I see all three tanks have the exact same amount of fuel remaining, despite starting with full wing tanks and only ~20k lb in the center fuel tank. And going forward, It seems to be equally using fuel from both the wing tanks and center tank - all three are dropping at the same rate. On the wing fuel tanks the "main" pumps are active per the fuel system page, as are both center fuel tank pumps. After takeoff and flap retraction, I would expect the center fuel tank to be emptied first.
I'm pretty sure this is incorrect behavior - the FCOM describes the center fuel tank pumps as producing higher pressure, and effectively preferring the center tank over the wing tanks, and emptying it first (similar to most other Airbus aircraft). Do you have documentation that indicates otherwise, or is this a mistake?
It does seem like someone else has seen similar behavior based on this Reddit post.
Thanks
