Lines are correct. I did change to a new tubing layout inside the tank. I added a straight piece of rigid plastic in the middle of the tubing between the exit and the clunk. I was told this would stop the clunk from "falling backwards" to the front and getting stuck. (I had this happen on another plane after a hard "landing"). I would have thought that this type of set-up would not change the fact that when the plane points down, it is hard to pick up fuel....but maybe the ST-90 wants a lot more fuel than a 40-50 size engine which is all I have run b4...or maybe less flex means it falls back less. However, I was about 3/4 full at the time....