This has me intrigued.
I have been flying the bus for a very long time and always thought the wing tanks fed the engines during start. I am certain that FCOM said something similar to “the CTR tank pumps run for two minutes AFTER engine start”.
BUT
I have just started reading through my newly issued company manuals on the IPAD and they have all been ….”customized” since I last flew in 2020 and are no longer simply copies of FCOM.
And reading the fuel system it clearly states:
“If fuel is in the CTR tank, the pumps run AT engine start for 2 minutes”
followed by
“They will also run before OR after the engine start sequence if the slats are retracted”.
So this implies the CTR tank is providing fuel during start?
Its no big deal, knowing this doesn’t impact the operation but it certainly goes to show that not all is what you think it is!