When you get the msg >FUEL/TANK/ENG if you turn the over-rides off but leave the cross-feed open you'll get the msg >XFEED CONFIG.
If you fail to turn the over-rides off but close the x-feeds you'll not get >FUEL/TANK/ENG.
The soft-ware IDS-503 in my case but can vary. This is how I've always seen it. Just follow the EICAS and don't try too hard to out-guess it. It's a simple system, nothing different to a Piper Navajo.
If you have an over-ride pump fail the MEL simply says "switch the corresponding pump on the other side off". It really is an easy system and the nature of your original question makes me feel you are looking "too deep". I do not mean any disrespect.
Last edited by By George; 6th September 2011 at 08:56.