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.

I believe you mentioned the electrical was alright, but anyway here is my 2 cents. I had problem with greasecar kit as well. It would pull oil fine but wouldn't purge. My problem was a poor electrical connection. The little fold-over one-wire-to-two-wire connectors used behind the switch are crap! Solder these connections and use shrink tubing to cover them. I've had no problems since doing this. Also, I bought a Mity-vac to pull air out of system when I change any filters (especially diesel filter) to speed up the process. Hook up Mity-vac to the end of the cigar hose until fuel comes out with few air bubbles, reconnect cigar hose and be on your way. Hope this helps.

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Brad
1981 300TD - daily driver
1963 Chevy II
2001 F-250 7.3 Power Stroke

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