@TJTurner Yes, I too had a Bravo rocker switch assigned to “Repair and Refuel”.
My mistake was to have it assigned to the “ON” action as well as the “OFF” action.
So I’ve deleted the “OFF” one of those.
Now I can adjust the fuel quantity via the normal Weight & Balance UI in the sim and my fuel gauges do work properly now.
Issue is resolved.
Thanks for your help.