Ok, putting this here because this was the closest thing to an answer I could find when googling for those damn fuel lines. I had to use a target keybind target_custom_next notteammate notmypet and follow to get close, then select interact from the targeting window. I got 5 out of the 8 before I could even see what I was supposed to be looking for. Could hear them, but they are small. 1 on each of the 6 ships, and 2 on either side of the big dome.
Hope this helps anyone else that can't find them, took me like 20 minutes.