I edited your picture with some questions



please confirm that the line marked supply is your wvo line from the tank, and that the line marked looped return is in fact your looped return.

for A, B and C, please tell me the destination of each hose.

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1985 MB 300D/T

Fell off the WVO bandwagon when people started trying to charge $2.50 a gallon for dirty vegetable oil.