Hi Nichole,
 
	It sounds like your petrol is either evaporating in the carbs or fuel is seeping back towards the fuel tank.. both maybe caused br a small leak somewhere.. suggest you take it for Arun then look at all of the fuel pipes to see if you can see where fuel has been leaking.  USING A TORCH NOT A LIGHTER OR MAINS INSPECTION LIGHT. 
 
	 
 
	CHIDDERS