I am new to this mod, so I am not sure if what I am experiencing is a bug or just me being inexperienced with the parts in this mod. The umbilical towers, as I understand them, are supposed to allow you to fuel your tanks and maintain electrical power to your vehicle, correct? I have no issue with the electrical feature, but when I try to fuel my rockets, I cannot get the fuel transfer started. Does the fuel transfer feature only work with FASA fuel tanks, or can it function with stock fuel tanks as well? Is there a trick I am not aware of for getting the fuel to start? I right-click the umbilical tower and click the "fuel on" button, but nothing happens. What am I doing wrong? Any help/training would be appreciated! All the other parts in this mod work great, and I love the way my launch sequences look now with these parts added. The umbilical tower is the only part that is giving me any issues.
EDIT: I changed the fuel crossfeed from FALSE to TRUE on the umbilical towers. Seems to have fixed the issue.