747s have some fuel warming in the form of the return lines to the hyd resevoirs being fed through a system of pipes in the fuel tanks. This is primarily for hyd fluid cooling and with low fuel levels you can see the hyd temps in the number 1 and 4 systems rising.
JT9 powered 747s have additional fuel heat other than that provided by the oil cooler/fuel warmer. It's necessary for most situations when you go tank to engine for the outboard engines.
The 747-400gives you an eicas warning LOW FUEL TEMP when the temp in tank number one reduces to -40. I saw it once flying accross Siberia returning from Hong Kong. We had to accelerate to increase kinetic heating as descending wasn't an option. It was a reasonablt common scenario and we carried extra fuel for this eventuality.