Soy bio B100 with get very thick at 40 degrees. My fuel supplier will not even deliver B20 after Thanksgiving. Because of possible problems with gelling. I would say the B100 was gelled at 18 deg and starved the fuel pump. Might have done some other damage also. These engines like fuel and doesn't like to be hungry.
I would put some of your fuel into a sealed jar and place it out in the cold/freezer and see what happens.