It is normal to see small air bubbles in the clear line from the IP to the secondery filter. When did you change filters last? Your mechanic coulda stured up crud in the tank and its now plugging the filters. (and/or tank screen)

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"