Based on the Sunoco Gas Station Help page, you may contact Sunoco Gas Station Customer Service by phone at 800-278-6626 (toll-free) or 800-786-6261 (questions and comments). You may also reach out to them by email at customerfirst@sunoco.com or make an inquiry on the Sunoco Gas Station website by opening the Questions and Comments section and choosing the “Customer Service” topic. Then you should fill out the “Comments” field and click “Submit”.