* Solved * Twin Boars leeching fuel radially?

[FroggyCanuck]

Hi good folks at the KSP forums! 

I've just gotten back into KSP after a few months of not playing it, and have a question on fuel usage on radial setups, specifically with the Twin Boar. Vanilla game. 

I have a five-orange tank setup (4 tanks around a main one) similar to this (not my pic) : http://i.ytimg.com/vi/hJLEAnzWRss/maxresdefault.jpg

I have two Twin Boars attached to each outer orange tank with decoupler and no fuel lines. My aim was to use the Twin Boars, decouple then use mainsails under the 5 main tanks. But when I launch, fuel empties from all 13 tanks at the same time (even the center one!)... I did a further test with just one orange tank and two Twin Boars attached by decouplers, and same situation, all three tanks emptied at the same time. Tested the same thing with regular tanks and only the outside tanks emptied.

Is this a bug? Or do Twin Boars use fuel differently? I thought tanks are supposed to empty vertically only if no fuel lines are used. My Twin Boars are magically using fuel from tanks they are attached to radially, even spaced with a decoupler!

http://s2.quickmeme.com/img/38/386a007910aa3434d7b7e4553b36991961d99f452b915a2ad38f8c894f9b8207.jpg      

Edited September 5, 2017 by FroggyCanuck

[Geonovast]

Sounds like crossfeed is enabled on the decouplers.

[FroggyCanuck]

Ah yes, that must be it!!!! Many thanks Geonovast! 

Very simple explanation yet completely eluded me. I must say I'm 150 hours in but never really messed around with crossfeed before, so I'll need to pay more attention to it! 

Cheers!
 

[SpacedCowboy]

Wait, all the decouplers start out with cross feed disabled. So,,, ?

[Geonovast]

4 minutes ago, SpacedCowboy said:

Wait, all the decouplers start out with cross feed disabled. So,,, ?

I've had them turn themselves on in the VAB.  Never noticed anything that triggered it, but it's happened to me.

[FroggyCanuck]

Yea, I can't explain why this occured but yea, I was also assuming crossfeed was off. Weird though, because even in my smaller test the error reoccured...

[Snark]

Moving to Gameplay Questions.