Fuel tank system, check: Preparation
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.
Ignition off.
Seal the intake air hose for the carbon filter container. (A rubber plug is sufficient on certain models.)
Expose the evaporative emission system (EVAP) valve.
Disconnect the hose (1) between the carbon filter container and the evaporative emission system (EVAP) valve.