You can buy an expensive electric-operated pump if you want, but we're kind of partial to a bucket and a funnel. It costs hardly anything and you get one final look at the fuel before it goes sloshin' down the filler neck. If you put at least 25 percent biodiesel in your tank (on top of diesel fuel), you should be able to smell the french-fry aroma within just a mile or two.
Please refer to our Biodiesel in Cold Weather articles for Cold Weather Must-knows.

