Gents,
This is in danger of degenerating in to a slagging contest wrt who knows more about the MRA4 fuel system, and is becoming personal (which will serve no real purpose). I have spent the last 2 years flying the MRA4 as one of the ATEC test pilots, but have now left the project so will refrain from commenting on the aircraft systems as, already, my knowledge may well be out of date. There are many people commenting on this thread who are unknown to me and may, or may not, have accurate knowledge of the MRA4. However, what I can say with absolute authority is that both the Short Fat One (who is not a ISK by the way) and Betty Swallox are both involved in the MRA4 programme, have a working knowledge of the MRA4 systems, have flown the aircraft, are current to fly the aircraft, and, therefore, know more about the aircraft, its systems and the safety case than most people on this thread.