It happened just after 6:30 p.m. on the 1800 block of South Chadwick Street on February 4.
The owner of the vehicle had just parked and was about to walk into a home when the carjacker came up from behind, pointed a gun and demanded the car keys, according to police.
The suspect was able to get away with the victim's car.
No injuries were reported.
Anyone with information on the suspect is asked to call police at 215-686-TIPS.