When you are at the limit of endurance (which one assumes you are aware because of the watch/the physical position i.e. on the way home) at the point when the first engine flames out then surely you think fuel ahead of a wider problem?? And if you do think fuel dont all pumps go on by default and if you damage a pump through some dry running then so be it??
i just can not imagine that at this point in his trip fuel state isnt the assumed cause of all the problems and if 80kgs is being indicated at the point of engine flame out its hardly a time to over think things?