Or even better, don't use the UAT at all because it is giving you NO extra benefit and only trouble. Here in germany most pilots are not using the UAT at all and the ones I know only had it for some flights because it causes trouble (bleed air, leaks's)

Use a standard Hopper tank, and felt clunks in your main tanks. This is more safe. All european manufacturers don't recommend the UAT.

This is just my experience and not mandatory!