Gwent Police is appealing for information following the theft of fuel from the Murco garage on St Cenydd Road in Trecenydd.
It happened at about 2.20pm on Monday April 27.
A man put petrol into a blue Honda that had stolen number plates.
Officers are trying to identify the man pictured in the CCTV image above who may be able to help them with enquiries.
Anyone with any information can call Gwent Police on 101 quoting log number 296 27/04/15 or Crimestoppers anonymously on 0800 555 111.