Hello Rupesh,
To troubleshoot the issue, you can run gcsfuse with --gcs.debug which can provide you more information about the operations. Did you try overriding the the user who mounted the file system using the"allow_other" mount option?
For future reference, this question is better suited on
ServerFault with the relevant tags, where community and Google Engineers are active as well.
I hope this helps.
Sincerely,
George