RE: problems with my DA50????
HAVE U ran with canopy off so u can see the tank and fuel line
i am thinking your clunk has come off or has a crack in tube and when inverted air is getting sucked in
do this run the engine on half tank and watch for air bubbles in fuel line you will see pretty quick .
do u have a dubro filler by any chance as they can open slightly and air can get sucked in .