The helicopter departed the Citywest Hotel to refuel at Weston Airport (EIWT). Having made a visual approach to the airport without incident, the pilot hovered EI-CGQ and air taxied up to the Jet-A1 refuelling area. Realising that he might be blocking the possible exit of the airport fire and rescue vehicle he started to reverse the helicopter. At that point the tail of EI-CGQ struck the Avgas fuel pump and the helicopter went into a horizontal spin and landed hard on the tarmac. The aircraft suffered extensive damage. There was no fire or injury.