Noise from gas tank
 

Belching noise and bubbling from gas tank.

what year/model? Sounds like the tank is not venting properly or there's an issue with the evap system. Do you smell gas?

Noise from gas tank
 

2015.5 s60. There is confusion about the Evap warranty whether or not the carbon canister is covered under the warranty or if Volvo did an extended warranty for this problem. But Volvo USA and the Volvo service center I took my car to, never heard of this problem. I do not have any check engine lights on or codes to check. Otherwise, it runs fine. I’m getting conflicting info about the warranty.