Clipped fuel tanks won't empty

[EmanonP]

Just came back to KSP after a few months.    Back then, if I clipped say 2 fuel tanks it would double my fuel capacity and  the total fuel would be used before the engine quit.   

(Liquid fuel tanks and engines)

Now when I do it, although it shows the double fuel capacity on the launch pad, the engine cuts out before using up the "other" tank, leaving half the fuel unavailable.  I'm using a very basic rocket....2 clipped fuel tanks and engine.

I just restarted a career, and I'm only on the very beginning of the tech tree.    I know later you access fuel ducts etc, but I'm just wondering if I'm missing something from the very start.  I have clipping allowed in the parts editor.

I've done some digging, and haven't found an answer so far.   Thanks for any info.

 

Edited October 19, 2016 by EmanonP

[Ultimate Steve]

Hmm. I'd say there's something wrong with the new fuel flow system on your install. I'd suggest re-installing and copying your saves over.

[Streetwind]

I'd go and systematically test to find the point at which it stops working.

1.) Built a craft with nosecone -> pod -> tank -> tank -> engine
2.) Launch craft, observe tank drain behavior
3.) Use the offset tool to move the lower tank a little bit more into the upper tank
4.) Go to 2.)