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How about air leaking into the fuel system on the '83, more when it has to suck harder when the WVO is really cold, or when you're going uphill?
Are you maybe mixing WVO with diesel #2 to "never have too much wvo in the tank"? If so, please short circuit the standard path and go do the research on blending WVO + D#2 blending before you put anymore WVO in your tanks.
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