I'm sure if I keep running a high % of bio that I'll see leaks.
I ran over 10,000km on B100 last summer, no leaks and no problems. Shortly after that, the fuel filter started getting restrictive, so I replaced it with the one that I keep in the trunk for just such an occasion. As far as biodiesel's gel points:
Check out the following link for the basic performances of the vegetable oil, the methyl ester (Methanol biodiesel, most common by far) and the ethyl ester (Ethanol biodiesel, very rare). (
Vegetable Oil / Biodiesel Characteristic Charts)You can fairly easily make some inferences about the performance of these when mixed with diesel #1
or #2, depending which you're using at a given time. Basically, if you're mixing 50-50, split the temperature differential between the cloud points / pour points / gel points two fuels for a reasonable guess at when you're going to be euchred if you're running on one or the other. However, the thing to bear in mind is that when you blend, you're making a mechanical combination, not a chemical mix. The upshot of that is that you don't perfectly combine the chemical characteristics of the fuel, so you could wind up with particles of frozen/gelled biodiesel in your perfectly liquid petrodiesel. Conversely, depending on the mix, you might have near-perfect combination and it's all good - just important to take those kinds of things into consideration. I run B100 as much as I can, but I do avoid it during the particularly low temperatures for the reasons mentioned here.
Glad you've got everything back up and running, and that you're loving the biodiesel!