I once got caught up with the whole air bubble, cavitation issue when I got my first turbine and was setting it up.
Wondering how to avoid it and what the best setup was.

After thinking about it I realised its just so simple.

I used 6mm Festo line as much as possible. My pump has 6mm inlet and 4mm outlet

My fuel lines are extremely short especially from UAT (which is flexible) to pump.

I dont use any filters and I set things up so that I don't have any sharp bends.

I paid attention to keeping it simple and tidy and all my runs have been without any issue and the Merlin sucks around 450ml/min at full throttle and zero air bubbles. UAT is always full.

To be honest I found setting up my turbine easier than my electrics.

Just don't go complicating things.