Thanks De Facto. Seems i'll have to seek official clarification by my airline.
QF22 - Our aircraft suite of manuals all say pretty much the same thing. Perhaps you should check what pump is used during APU operation on your guys 737's. I think you'd be surprised at your findings.
Irrespective of what pump is used, it doesn't matter much as long as we stick to procedures, which clearly state that any pump can be used (with a very subtle hint to use any one of the #1 Main Tank pumps, preferably #1 AFT, depending on which manual you read and use).
I just need to know... now!
