EpisparhI never used additional module for fuel. I do fly some ships without fuel scoop in the bubble but then I filter by populated system and apply filter to route plotting. You need to be extra careful when jumping to a system because if there is no refueling station ... well, I have a trump card "Call UNX Conqueror".
For some reason I thought I might have to pass through regions between the Bubble and Colonia where there were only brown dwarfs in range. Well, it turned out these regions didn't exist, at least not on that route. I felt clever adding fuel tanks, until I learned that the galmap plots routes always on the basis of maximum unladen weight, i.e. with empty cargo but maximum fuel. If I remember correctly, I had all D-rated core internals except for an A-rated FSD, and my optional internals were a DSS, an A-rated fuel scoop, and fuel tanks, fuel tanks, fuel tanks, nothing else. Total fuel capacity: 14t. Jump range: 17ly. Without the extra tanks it would have been 23ly.