Fuel distribution system
There really needs to be a fuel distribution system in this game. It would be a component that regulates and distributes fuel to each part that needs it, and allows for 2 or more fuel tanks to link to it. Possibly also allowing for emergency fuel tanks for those times you forget to carry some extra with and you're already halfway to destination and realize you forgot to fill up.
I realize this could add a small layer of complexity to builds, it would be open up some interesting mechanics.