Adobe premiere can't support flv for import, I know one plug-in which is can import flv into adobe premiere. That is FLV importer plug-in.
Why not have a try?
This FLV importer plug-in has wide efficiency in application, supporting On2 VP6 and H.263 video codecs, and RAW, Nellymoser, MP3, ADPCM and RAWLE audio codecs.. And here is a step by step guide about how to download and use it
http://www.flash-video-soft.com/blog/?p=8
But it works only for windows vista, xp, 7
Hope it helps, email me if you need further help.