Hi, i have a problem with one rocket i build and i dont understand why. http://s14.directupload.net/file/d/3414/wgm6w3o6_png.htm As you can see on the screen, the fuel tank in the middle gets empty even its engine are not on. Its only connected to the outside with the TT-70 radial coupler. There are no pipes (dont have them yet), only the coupler and struts connecting the middle with the outside part. Normaly neither struts nor couplers transfer the fuel automatically or? At least i never saw this happen yet. Does the problem come from the tri-coupler? Some help for a newbie would be nice. Yes i know, that kind of rocket is not the best, efficiency side , just wanted to see if it would work.