Ok well I'm reporting a bug that's annoyed me a lot of times that includes the inlet air intake, there are some major glitches where sometimes the air intake gets screwed up and if you add another inlet on and take it off even if there are about four other inlets the fuel trail is black and doesn't provide any thrust, (this isn't happening with xml in case you where wondering) so yeAh anyway hopefully a dev see's this and it's been helpful :-)
(Also applies for beta version)