Fuel transfer changes?

[PTNLemay]

So, I haven't played the game in a long long time, maybe over a year.  I decided to get back into it by doing a random, no limits, sandbox run to the mun.  I threw 5-crewman ship together and I'm testing it in orbit.  And... I can't seem to transfer fuel from one tank to the next using the old alt+click trick.  It's possbile I'm forgetting something obvious, but I think I'm doing everything right.  Hold alt, click one of the tanks, and click the second tank.  Then release alt.  

I get the two little windows showing the states of both tanks, but no options to transfer.  This is in sandbox mode, so there aren't any upgrades needed to be unlocked or anything.  Am I going crazy?  Or did they change the way fuel is transferred at some point?  I'm running 1.3.1 off of Steam with no mods installed.  Hard mode, in case that matters.

 

Edited November 4, 2017 by PTNLemay

[bewing]

Can't do fuel transfers through a heatshield with default settings. You may be able to get around that by changing your "Fuel Transfers obey crossfeed rules" setting in your Difficulty options.

Edited November 4, 2017 by bewing

[PTNLemay]

Okay, I knew it was something I'd missed.  I should be able to run a line around the side and make the fuel connection that way.  It is more fun when the game adds these limitations, but it helps to know what it is that's doing the limiting.

Thanks for the quick answer bewing.