solely responsible for the front tires, while the other is responsible for the rears. Until the 2022 season, NASCAR required a wheel to have five traditional lug nuts, as opposed to the single locking lug nut seen in other professional racing categories. Many jackmen watched the tire changers to make sure the lug nuts are tight, as NASCAR rules stated that all five lug nuts must be in contact with the wheel. The fueler or gas man fills the car with Sunoco Green E15 racing fuel using a special gas can. The fueler is normally prohibited from doing any other work during a stop but may also help pull old tires from the race car after lug nuts are loosened if the car does not need fuel. Prior to the 2011 season, an additional crewman (the "catch-can" man) was allowed over the wall to hold a special can over the car's fuel system overflow port to collect any spilled fuel. NASCAR disallowed the catch-can man in 2011 after self-venting fuel cans were developed. The tire carrier brings new outside tires over the pit wall and removes and installs the front tires. They must maintain control of old tires as they are being taken back to the wall, where additional team members will have the new inside tires ready and waiting. The front tire carrier is usually responsible for pulling damaged front fenders away from the tire if necessary. He may also be responsible for cleaning and adding or removing tape to/from the grille during a pit stop in order to adjust front-end downforce and engine temperatures. The utility man is only permitted over the wall in the second half of the race (sometimes earlier if conditions and NASCAR dictate otherwise). He may clean the windshield and provide the driver with fresh drinking water and other necessities, but he may not make any other adjustments to the car. IndyCar Series In the IndyCar Series, a pit stop is a more complex operation than in NASCAR, but far less so than in Formula One. Rules permit six mechanics over the pit wall during a stop. The pit rules and procedures have origins in USAC National Championship racing. The spare fuel for IndyCar competition is stored in large pitside fuel tanks. Each team's tank is filled to a specified volume of fuel, depending upon the race distance. Teams are also given a certain