All airliners have fuel lines that run aft of the wings in order to feed their APU’s.

A lot of airliners also carry fuel in the fin i.e. 747, VC-10, Tri-Star and Concorde though the latter is of no account here or the VC-10 for that matter. Pod mouted engines are fine the way they are on the 737 but on pylons then the pylons create drag. Basically you pay your money and take your choice. they all have advantages and disadvantages.