Folks,
If you're diving in to this thread in the last few pages, please don't be put off if your question doesn't get answered or the terse reply directs you to a post sometime back, but it really is worth doing some looking back at the last 6 or 7 pages before asking repeated questions. Imagine what the long term posters see when your really obvious questions pop up alongside the fact you've newly joined and have 1 or 2 posts?
That said this is the internet and all are equal.......now, any questions on the 135 fuel system?
Henry, your last line of your post is very good. For the main tank to end up with the 76Kg it would suggest heavily that the transfer pumps had been operated at some time during the flight, this tends to tie in with (Sids?) the hypothesis that having juggled the switches in flight, the fatal mistake COULD have been to select the prime pumps to on by mistake in the dark instead of the transfer pumps, of course IF the CAD was working the cautions would have shown the error if the pilot looked to verify his action. Still doesn't in any way explain the failure to act on all of the subsequent warnings and fuel level indications before flame out.