Okay l cleaned my pocket bikes carburetor, its a giovanni 49cc pull start engine. The petcock is now put back together but its super loose, its not tight, and when u spin it its like so easy. its just hanging loose, l am wondering if there is any missing pieces or trick to putting it back in.

thanks

is the tank itself threaded,or is there a nut on the inside ?
try wrapping the threads with teflon tape before screwing it back in