I've been having some problems recently and it was obviously temp related, The WVO I have has a lot of animal fats in it, I'm going to try an experiment by putting the tank pickup line right next to the return line inside a jar inside the tank, the theory being as the engine warms up the fuel manager will squirt in warmed up BioD. If that doesn't work then I'll have to pour in more DinoD
clicky on pic
http://pubs.ext.vt.edu/442/442-880/442-880.html
clicky on pic
http://pubs.ext.vt.edu/442/442-880/442-880.html