Why can't whale blubber be used for fuel?

It was used as lamp oil throughout history, it has a huge biom and with proper processing should work great as a bio-diesel fuel. Since we're running out of crude and the prices are subject to the whims and appetites of people that hate us anyway why not just begin hunting whales again? Probably enough whales left out there for a few years and people that drive diesels (like my Humvee) need an inexpensive fuel source.