The manager of the BP Service Station in Crawley Road, Scaynes Hill, is advising anyone who has used the ATM on site recently to check their statements.
Jay Patel told the Mid Sussex Times that an investigation had been launched after a number of customers had complained that they believed their cards had been cloned and used in America.
The operators of the LINK ATM, which is run independently from the service station, sent out an engineer to assess the machine and now CCTV is being checked.
Investigations are continuing and it has not been determined if the petrol station machine is responsible for the reported incidents.
However, Mr Patel, who said he was very angry and felt guilty - even though he is not responsible for the ATM - wanted to ensure people check their statements just in case they too had been victims of fraud.
Have you been had your card cloned recently? Email firstname.lastname@example.org