Which is why, at lower fuel states, the total fuel remaining needs regular re-calculating, by adding up all three tanks, and pilots should NEVER turn
both transfer pumps off.
Dependant on attitude, you want one or other transfer pump to move any useable fuel into a place where it can feed your engine(s) until you've landed safely.
The closer you get to MLA, the more frequently you calculate endurance - to MLA, not to dry tanks - and the more aware you should become of the likelihood of captions. Although anything below about 100 in the main tank will likely have generated one caption already, depending on attitude.
I, or someone else, has posted it before, but the slightly corrupted quote from Samuel Johnson (1709-1784) "The prospect of being hanged focuses the mind wonderfully" works well in aviation the closer one works to the published limits. The phrase regularly moves forward in my mind whenever the sphincter tightens!!
