It happened at the 7-Eleven at 787 E. Route 70 in Evesham Township on May 10.
According to police, the driver got into an argument with the attendant after being told he was not allowed to pump his own gas.
As they argued, the passenger became involved, police say, and then the passenger punched the attendant in the face.
Police released an image of the passenger on Tuesday.
Both suspects then fled in what was described as a 'newer style black muscle car,' possible a Ford Mustang or Chevy Camaro.
The gas station attendant was not seriously hurt.
Anyone with information on the suspects is asked contact the Evesham Police Department at 856-983-1116.
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