Thanks guys, Cavitation is a new one for me, air leaks yes, LOL

I'm currently only using the 2 main plastic tanks, there is a 30oz dubro tank on top, but that is the smoke tank, My boy told me that the smoke vent line had little pressure and there would be no issue tying into the main tanks vent line so there is only one vent whole on the bottom of the jet. But at this point I don't want any extra issues so I will make it separate.

I hope its not the filter as its a new UAT, with only 4 test starts and 1.5 flights, but I did have a huge issue with algae in my diesel last year so I will do your test when I get home from work.

Thanks guys, Its crazy, this is the most simple fuel lay out of any of my jets and its the one that causing me issues.