Have a friend who needs help. She says leaking fuel from top of tank, even when car is off. She says leak is worse when car is at idle at stop light than when driving. Was thinking fuel line on fuel pump, but don't know why it would leak with car not running. I heard leaking fuel was not a rare issue with this car, 09 G6 with approximately 95k. Do you think she is just wrong about leaking when car is off? Any advice will be welcome or sugestions on what to look specifally look for. Thanks in advance.