Dan's 240D runs on WVO
Compression fittings allow the use of copper line inside the heater hose. Here is the heart of the whole conversion.  Hot coolant runs directly from the engine to the trunk, where it then flows around my filter (racor 490 - 2 micron) then through my WVO tank and then straight back into the stock coolant system immediately prior to the stock thermometer. 
The WVO flows from the heated tank through the filter, and then through the hose-in-hose (where hot coolant directly from the engine is flowing towards the filter and tank) and then directly to the fuel selector valve which is directly prior to the IP.
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