greenzo,

youre on the right track, implement a 2 tank system. but for your sake, dont rely too much on this forum. i asked some very similar questions and there is a 'sect' (for a lack of a better word) that is anti-WVO and to a lesser degree, biodiesel. i would use this site as a reference for general repair and modifications and not WVO questions.

the best place for wvo/BD types of questions are:

biodiesel.infopop.cc
frybrid's forum

i'm on the same path, but have not 100% decided on which route to go.

you are going to find some pro-wvo and BD. just search through the forum and communicate with them and try to ignore the ones that have nothing positive to say. so far, you've been spared the usual wrath.