Thanks guys I thought this thread was dead.

The UAT was sucking in badly until I found the Fuel Restriction in the line. Now Removed, I connect the Data Box of the KT 180 and run pump at full power with the line at the motor going back into my fuel jug, the uat only sucks in a little.

I have already increased the vent line size, and tonight Im going to add a 32oz tank in the system, as it currently sits it has 2 plastic tanks that hold 118oz and this is just to short of a flight time for me. So I will make the 2 stock tanks Y and feed the 32oz old smoke tank then run it to the uat for more capacity and may help with my little air in the uat issue as pulling from one tank has to be better than pulling from 2 tanks with a Y fitting