Im using frybrid kit - HIH. Aluminun line inside 5/8 heater hose, this provides best heat transfer possible. Its either 1/4 or 3/8 ID metal line inside the hose. Polymerization is not an issue since there isnt any air inthe lines to react with the VO (but the whole tank is aluminum so I guess it could still be an issue - has been fine for 30k)

why would you be running VO pump when VO was cold? you should be waiting till system is at 160F coolant before switching to VO, right?

Be really careful how the hose is run to tank. These old benzes dont have much ground clearance, my lines have takin a beating over the last 30k miles. I think there is way to run lines inside the car, or at the very least protect them on the underside with some aluminum extrusion.

Frybrid sells the VO fuel pumps too, Ive heard they are quite reliable, although more expensive than the cheap pumps.

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Paul
Benz-less
I need an SDL !