Rattle Under Pass floor board 08 GTI

Hi I was wondering if anyone has any info on a rattle that sounds like its coming from the passanger floor boards. I read on here about fuel lines dampeners could possibly help this. Can anyone tell me if this is true or of anyone has any info on this? The rattle only happens at idle.
 
Thanks

its an 08 so i would take it to the dealer and have them look at it, its free