Under back seat, remove lower seat squab. On offside righthand (drivers side) Remove inspection cover ,2.0 litre Impreza 2009 (not WRX )was All in one Feul module with filter built in. Replace the whole module.
The 2009 Subaru Impreza runs on regular unleaded.
How To: GD: Fuel Filter Replacement - Subaru Impreza WRX STI ...
The 2004 Subaru Impreza runs on regular unleaded.
The 2003 Subaru Impreza runs on regular unleaded.
The 2014 Subaru Impreza runs on regular unleaded.
The 2008 Subaru Impreza runs on regular unleaded.
The 2001 Subaru Impreza runs on regular unleaded.
The 2010 Subaru Impreza runs on regular unleaded.
The 2013 Subaru Impreza runs on regular unleaded.
The 2002 Subaru Impreza runs on regular unleaded.
The 2012 Subaru Impreza runs on regular unleaded.
The 2005 Subaru Impreza runs on regular unleaded.