No. They won't allow you to, and those stations usually have the pumps set with a card requiring an employee to unlock it.

Plus, it's illegal. https://www.nj.gov/labor/safetyandhealth/resources-support/laws-regulations/gasact.shtml#3A-6

34:3A-7 says "No person shall dispense fuel at a gasoline station, unless the person is an attendant..."

The law says the fine would be between $50-$250. I have no idea if anyone has ever been prosecuted or not under this law.