In my spare time I make and install 2 tank systems in these Benzes locally, (up here in canada). My own personal system is alittle differant than the other kits available on the internet and it is very simple.

I usually sell a kit installed for between 800 and $1000.

I use a mercedes fuel sender when running on veggie oil to tell the dash gauge the fuel level, I have a coolant heated tank in the trunk that is heated by a coil of stainless steel gas hose. I then run common 3/4 heater hose from then engine compartment along the fuel lines to the trunk compartment. The fuel filter is heated with a glow plug that cycles around 75-80 deg C, then the fuel passes through a selector valve and into the stock fuel system. The downside is longer changover times, the upside is redundant filters. Depending on availability I also use Fattywagons injector line heaters, I use a pollak 6 port unit to control fuel flow, and all the appropriate relays and fuses.

Before I sold my example kit in my car it ran excellent on Veggie oil filtered to 5 microns using mcmaster car PE filters.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D