Hi, I have tested this issue with only the two mentioned mods installed, otherwise completley stock - just tweakscale and modular fuel tanks. (and latest module manager) First I installed tweakscale, and it acted normally - when I changed the size of a tank, its physical shape as well as the amount of fuel it holds changed. However, then I installed Modular Fuel Tanks, which seems to break this behavior. Tweakscaled tanks change in physical shape but the amount of fuel it holds does not change. Help would be greatly appreciated Thanks