The incident happened just after 12:00 a.m. Tuesday at the BP Gas Station on the 900 block of W. Route 70 in Marlton.
Police say two men, one armed with a handgun, approached the attendant on foot after he had just finished pumping gas.
They then forced their way into the office at which time they stole approximately $400 from the register.
The suspects then fled on foot towards Conestoga Drive.
Responding officers established a multi-block perimeter and a K-9 track was conducted.
It was determined from the K-9 track that the suspects likely entered a waiting get-away car.
Anyone with information about this investigation is asked to contact the Evesham Police Department at 856-983-1116 or the Confidential Tip Line at 856-983-4699.