Davco 382 Fuel pro tiny air bubbles

Remove the inlet check ball/fitting from the davco and check for blockage or debris. Inlet restriction can cause aeration. From there suspect a suction leak introducing air between the tanks and the filter.

 

Look closely at lip on plastic dome under o ring they can and will develop cracks.
when black collar is tightened down.

 

I am having the exact same problem with my 04 Columbia 14L Detroit diesel, a lot of tiny bubbles in the glass tank, and white smoke in the morning with a cold start then everything goes back to normal but not the bubbles. Replaced the fuel filter and also replaced the glass that got from another truck but the problem is the same, any help would be appreciated.