Some twenty years ago in my city a couple of ex-cons (if you can believe it) decided that to improve fuel atomization and therefore efficiency, in carbureted engines ( a good thing in itself ) that heating the fuel would be the way to go. Given that the volume ratio of fuel to air is around 1:9000, which do you heat, the air or the fuel....I wonder.....So they developed an engine coolant heated heat exchanger for the fuel to pass through. Several cars burst into flames while idling in traffic, and the device was withdrawn on the orders of Transport Canada. Some people just don't take enough physics in high school.
Have you ever seen a Porsche 944 Turbo with the little electric fan that cools the turbocharger after shut down? Inelegant engineering.
Rhys