ORIGINAL: perrye

I just got my first scratch built plane up and flying it was a Dazzler. I had one successful flight then on the second flight I started to do maneuvers and the motor cut-out. I believe it was caused from the pick up in the tank not getting to the fuel. The plane was doing a loop then an aileron role, leveled out made a left turn, sputtered then cut out. The motor was a .40 LA the tank was 6 oz. Is that the reason and if it is how do I fix it, if not the reason what could it be. I also have a external fuel filler in the line up. Thank you, E