So I have this very new to me (got yesterday) greasecar converted 81 300SD that had a fuel problem when I looked at it at first. Owner took the car to my mech and now somehow the diesel return line is returning to the veggie oil tank.
We found this out this morning when the car sat at idle to warm up and we had a faucet out the bottom of the trunk where the diesel/oil blend was squirting out of the air pressure hole on the top of the veggie oil tank.

Called the mech and he said they did do something with the diesel return but they don't know anything about the system so we need to look at the install manual that comes with the greasecar kit. Which we have.

The question is what am I looking for when following the lines around under the hood? Pics would be great as this is my first foray into the greasecar adventure.

Thanks bunches (and no laughing!)

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Ginny in Denver-ish
78 300SD, 265K (mine)