"zatatime" wrote in message
...
Technically speaking, I think the guage only needs to be accurate when
empty (I may be wrong on this but remember being taught something of
this nature).

That's a common misconception, but it's simply not true. The certification
regulations require that the fuel gauge correctly indicate the quantity of
fuel in the tank.

As has been mentioned elsewhere in this thread, they don't say to what
accuracy they need to indicate that quantity. But they do need to indicate.

Pete