From what I was told by the import mechanic down the street is that processed WVO is more viscous than normal fuel if you try to run it through a normal fuel pump, it will quickly leak all over the place. I also thought that the conversion kit for a 2002 Golf included a seperate tank and a toggle switch, the idea being that one starts their vehicle on normal diesel and then switches it over to WVO after about 15 minutes.
My understanding of converting a 2002 Golf to run on WVO is that it is a 3-part process: Buy/build/learn how to use a WVO processor, intstall a conversion kit (which heats up the WVO fuel line I think), install the higher-viscosity pump.
I didn't know that WVO and biodiesel were different. I'm getting different information from almost everyone I talk to, so any clarification would be super helpful. The viton seals info was awesome (thanks Phil and atc!) My Golf needs a new fuel pump anyway, so if I can just buy the normal one, that would be helpful, but they are expensive, so if anyone has done this conversion or knows someone who has, I'm all ears! thanks!