V70 XC AWD L5-2.4L Turbo VIN 56 B5254T (1998)
Fuel Tank Pressure Release Valve: Description and Operation
The Fuel Tank Pressure Relief Valves are located in the fuel filler cap. Two safety valves prevent damage to the fuel system in the event of damage or
blockage to the fuel tank venting system or it's hoses.
One Fuel Tank Pressure Relief Valve opens in the event of fuel tank over-pressure, the other Pressure Relief Valve opens in the event of excessive
vacuum within the fuel tank or the tank venting system.