During practice, refuelling is only permitted in a teams garage area or in the FIA garage. Race-refuelling systems may only be used in the pit lane during qualifying and the race. The driver may remain in the car and the engine left switched on, unless a system not approved by the FIA is being used. All personnel working on the car must wear protective fire-resistant clothing and an assistant carrying a suitable fire extinguisher must be beside the car during refuelling.
Teams are free to alter their cars fuel loads at will during practice, the first two stages of qualifying (Q1 and Q2), and the race. However, once qualifying is over teams are forbidden from connecting to the fuel system of any car until the start of the race.
Furthermore, no refuelling is allowed during Q3 - hence drivers participating in that session must start the race with whatever fuel was left in their car at the end of Q3. If a driver makes it through to Q3, but is then unable to compete in the session, his team must inform the FIA immediately of how much fuel they wish to add to the car.
Refuelling when a race has been suspended is forbidden unless a car is already in the pit entry or pit lane.