I have been working on a design for a kit to convert my 240. I plan to use a coolant heated filter, hose in hose fuel/coolant line, heat exchanger in the veg tank, and two 3 port fuel valves. I am also planning to use the fattywagons injection line heater for an extra heat boost before injection.

I am wondering if it is a good idea to have each valve switched independently. With independent control I should be able to purge the system with out the residual fuel or oil in the system being returned to the wrong tank. Also should I add an extra pump to the veg oil supply line, or will the stock lift pump be enough? Should I consider adding a 12V fuel line heater to the mix as well? The coldest temps around here are 0 degrees F. I am considering using a 110V heater in the tank to keep it warm over night.

Thank you for your advice. I've attached a lame schematic drawn in MS Paint.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine