Pneumatic Fuel pump for motorcycles and motor scooters. 
(Vacuum pump)
 
This is for a gy6 motor which is used in all the sunny scooters, elite scooters, jm star scooters etc.
Basically if your fuel pump looks like this, it's the right one.
These have a tendency to perish and stop working, and they are not repairable. 
Current stock may vary slightly in appearance from pictured product.
Installation available in Rolleston, Christchurch.