SJ- A is going to valve A on the right (NC?) side.
B comes off the banjo fitting on the diesel filter.
C goes to the return line to the diesel tank
supply line is indeed the supply line from VO tank
what you marked looped return actually is the inlet to the VO filter. It wraps around to the 90 degree fitting that is at the right edge of the photo.
All filters come before the solenoids. I will take expanded view photo in the daylight and label entire system. I think it's plumbing or electrical. Otherwise, how could the engine keep running? (Valve A would shut off the diesel and with no flow from the VO tank, how would the engine get fuel?)
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Rich
83 300D
98 E320 Wagon
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