There used to be a story that an unfortunate jag pilot on experiencing an engine rundown while aviating followed his FRC to open the crossfeed cock. Shortly afterwards the second engine failed reducing his options to zero. Faced by a VSO some time later demanding why he done such a thing he requested the VSO to explain via the FRC, what he had done wrong. Some minutes later the VSo pointed to an appropriate paragraph at which point our boy displays his aircrew ever right stopwatch and says "I ran out of fuel six minutes ago SIR