try this thread. it may have an answer for you.  seems like a few ktm owners have had the same problem.

and there is a recall on your bike's fuel venting system that sounds like it would create the problem you're describing

http://690enduror.blogspot.com/2014/12/2014-fuel-breather-hose-and-abs-wiring.html

http://690enduror.blogspot.com/2015/07/fuel-filler-neck-valve.html
 
http://advrider.com/index.php?threads/ktm-1190-adventure-fuelling-problems.926546/