That hissing sound is normal pressure build up from the fuel pump and nothing to worry about - pressure which is also NECESSARY for the vehicle to run at peak eficiency and why you should ROUTINELY turn your gas cap until you hear it click when putting it back on after fueling.
The Game - 2006 Grand Opening Grand Closing 5-5 was released on: USA: 31 January 2012
Captain Eo Grand Opening - 1986 TV was released on: USA: 20 September 1986
City of Light Grand Opening - 2009 TV was released on: USA: 1 March 2009
For Better or Worse - 2011 The Grand Opening 2-7 was released on: USA: 3 August 2012
Players - 2010 Grand Re-opening 1-2 was released on: USA: 9 March 2010
The Little Couple - 2009 The Grand Opening 2-12 was released on: USA: 12 January 2010
Food Rush - 2012 Grand Opening 1-1 was released on: USA: 8 September 2012
The Jeffersons - 1975 The Grand Opening Part 2 4-2 was released on: USA: 24 September 1977
The Little Couple - 2009 Grand Opening Weekend 5-9 was released on: USA: 17 April 2012
The Larry Sanders Show - 1992 The Grand Opening 2-17 was released on: USA: 22 September 1993
The Grand Opening of Euro Disney - 1992 TV was released on: UK: 11 April 1992 USA: 11 April 1992
My iZon Orlando - 2013 Hyatt Regency Grand Cypress Grand Re-Opening 1-8 was released on: USA: 7 June 2013