Mine was a manual system,I had a boat tank in the trunk,I ran my diesel tank fuel line into the trunk,and used a water hose garden splitter,backwards,ran a veg line on the other side,then fuel pump,to push either fuel back down to fuel line.At engine,I used a line after primary filter to a 5 micron filter that had two intakes and outlets,plugged one out let,and ran fuel to fuel coolant heater,from there to lift pump,then injection line heaters from fattywagons.com ,return line I used a valve to loop fuel when running veg,it returned into other 5 micron fuel filter inlet.I smiply, switched valves back to diesel when close to home.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt