WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Checking Pressure Valve In Fuel Tank Filler Cap
Courtesy of VOLVO CARS OF NORTH AMERICA.
Install the fuel filler cap to the adapter. Turn until you hear a click