1983/300CD,
the clear lines I have installed are PVC lines. Not at all the first choice to run the car on but I figured that for a short time they should be able to withstand the diesel fuel and not harden. Perhaps that's not a valid assumption. I will get some of the real stuff to install.

I also got finally got the adapter for the compression tester yesterday and will test the compression when I get to it (over the weekend?).

chocolatesoup,
My car would always run better on VO than on diesel. The problems first started to show themselves on diesel, then later also on VO. It's entirely possible that I have an air leak somewhere that worsened gradually over time. The question is: where? Since your conversion is fairly recent something like an air leak is the most likely. It looks like your problem is on the VO side but could also be in the fuel lines the two systems have in common. A leak that's not an issue on diesel could be a big problem on VO due to the difference in viscosity and temperature.

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84 300SD with Greasecar vegetable oil kit. Boston, MA