I'm just fascinated by what 'they' don't bother telling us.
I think the days of a pilot needing to be able to describe the fuel system
in detail are almost before my time.
I did my 74 Classic course well over 25 years ago, followed not long after by my 400 course and even then Fuel heat got little mention beyond what was in the "Flying manual" though maybe on the Classic the Flight Engineers studied it in depth, can't remember.
My type change to another Boeing a few years back was
much more abbreviated than previous courses and really was limited to "if you can't control it from the Flight deck or it not an issue in a QRH" you don't need to know and it probably doesn't get taught for a TR/conversion.