Scammers approach drivers at the pump offering to help and then swap nozzles to keep the pump active on the victim's credit card. They wait to turn off the pump until it shuts off automatically or the card reaches its limit, then pocket cash from the next customer. Victims often don’t notice extra charges until days later.

In Philadelphia, a driver paid $150 in unauthorized charges after refusing help and driving off with the nozzle still active. The national average gas price recently topped $4 per gallon, increasing the potential cost per scam incident. Owners of smaller tanks, like compact cars, face disproportionately high charges.

Law enforcement has reported similar schemes in California where arrests were made following multiple nozzle-swap incidents. Police warn scammers can be aggressive and advise customers to guard the pump and inspect receipts promptly. Some stations have increased surveillance and staff presence at pumps to deter fraud.