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Thank-you, Chainbreaker for posting a very useful article. The above issues, and especially the above photo, suggest that biodiesel has the same problems of engine sludging that WVO-based fuel blends, as well as heated two-tank SVO systems, have been found to have. I propose that this is...

Thanks for the useful information on biodiesel, Jeff. I do not use pumps when moving my waste oil-gasoline blends, due to the problem of emulsification. Instead I use pneumatic pumping, which is just producing a positive pressure above the fluid needing to be moved to a tank that has a lower...

It is common practice in the UK, where biodiesel is far bigger than it is here in the USA, to add gasoline at about 5% to biodiesel, which reduces gelling, and forces water out of solution with the biodiesel, which prevents algae formation.

As for biocide for diesel fuel and biodiesel, gasoline in small quantities will kill the critters in the fue, and force water out of solution. 5% should work fine, and it helps as an anti-gel in the winter as well.