Authorities say the man pulled up to the grocery store and got out yelling he had been shot.
Officers say the victim is a juvenile believed to be 16 or 17 years old.
His truck was shot three times, and he was hit once in his left arm.
A security guard called 911 and a good Samaritan used their sweater to stop the bleeding.
The victim is expected to survive.
Anyone with information is asked to contact the Fresno Police Department.