I had a bad experience with my UCD yesterday. I flew one flight and had just refueled when I noticed fuel dripping from behind the wing. I drained the tank and pulled off the wing. The screw holding the bung in the tank had loosened and it had been leaking quite a bit. It was dry in the front of the plane but had soaked a little down the fuse sides and back by the rear wing screw plate. (my tank is on the CG) It shouldn't take much to dry it out but I am wondering how to keep it from happening again. IF I put loctite on the screw or in the threads there won't be any left by the time I get it tightened down. The rubber will wipe it off. I may try some RTV on the head of the screw and hopefully it will be enough to keep it from loosening. I had close to 100 flights on the plane as of last night.
Later,,,basmntdweller