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the 3-way banjo on fuel filter housing mixes fuel return of sec filter and injectors via cigar hose to the tank.

you can find and fix air bubbles by trial and error replacing parts one at a time, or do it the easier way with a mityvac.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked