Hello, I have an issue with the mod:
Fuel tanks attached to the "MK2 tricoupler" 0.625m side adapters (there are 2 tricouplers by the same name, this issue is only with the one with the 2X 0.625 and 1X 1.25 attachment points) don't allow fuel cross-feed. It works for the left tank, but not the right one, (seen from behind the vehicle, with the adapter attached naturally as a rear engine mount). It doesnt happen with any other adapters that i know of and I've only seen this with the MK2 expansion mod so far. I was able to easily recreate the bug and tested some adapters other adapters and isolated the issue to this one. I have not tested all parts from this mod. I have also tried adding each fuel tank separately without symmetry, which garnered the same result.
My guess is it has something to do with how the game handles adapters that convert to more than one type of attachment point. Or maybe it's to do with the fact there is only 1 config file by the same name as the 2 parts which share that name (at least in-game), but really I've really no clue.
The issue can be worked around using external fuel ducts.
Aside from that, love the mod. It really fills in the gaps and then some.