After a few days of using my turbine I usually have one or two very small bubble in the lines before the pump. I have looked at different fittings but it doesn’t seem to make a difference. Is this normal? A concern? It appears to me linked to a difference in pressure with the fuel tank below the UAT and the fuel wanted to flow in the direction of the tanks but it cannot because the pump is off and valve closed.

Moderator pls delete