Gelling point?
 

At what temp sould I worry about gelling if Im running B99? Thank you.

As i understand it, it depends on the gelling point of your feedstock. I believe I was told biodiesel came out about -50F from the feedstock. (that is just what I was told from a salesman at a biodiesel processor producer.)

yes it does depend on the feedstock. soy b99 is around 35 degs F and it will start to cloud a little sooner than that. there are some additives you can use to lower the temp but i have never had to use any. you can always test it for yourself and put some bio in a jar with a termometer in your freezer and see when it gels.

Thanks guys, If it gells, am I stranded? I plan to go to Tahoe in a few weeks, and it can get real cold there. I have a 3/4 tank full of b99 right now. If I get it down to 1/4, and fill it up with dino, should I be ok? What is feedstock? I purchase this fuel from a place here in town.

I have never gelled but i would imagine you would be temperarly stranded utill you changed you fuel filters and found a way to heat you tank. I think you will be fine running you truck on biodiesel on the way to Tahoe and then filling up of diesel when your tank gets low. If you are worried or it gets colder buy some anti gel additives and "double dose".
Feedstock is what kind of oil the bio is made from. There are many feedstocks and they all have differnt gel points.

Here is an in depth study of different types of biodiesel feedstock at different temps
http://www.biodiesel.org/resources/r...28_gen-354.pdf