TT visitors and local residents are being told there are controls in place over the storage of petrol in large quantities.
The Office of Fair Trading and the Isle of Man Fire and Rescue Service say anyone storing more than 10 litres must obtain a licence from the OFT.
The rule doesn't apply to petrol stored in the fuel tanks of vehicles.
To assist TT competitors, two temporary licensed stores have been organised.
They can be used by contacting race control, without the need to obtain a personal licence.
To access the fuel stores ring Group 4 Securicor on 495105.