Talked to my mechanic, he said that a screen blocks the chain from entering the fuel lines and that the intake is elevated from the bottom of the tank (hence the unusable fuel) so the chain will most likely sit at the bottom. In a nutshell: It's ok to go flying but we'll take a look this week and he's confident that we'll be able to fish it out.
However I'm not quite satisfied flying with a chain in my tank, so no flying until we get it out, wich is quite annoying because the engine has just returned from a MAJOR ($$$$$) overhaul in the states and she is a charm to fly
