MK1 General Discussion : Millers diesel eco max

I put millers power eco max in the vectra so thought I would do the same with the kuga but how the hell can you put any in. The  fuel hole will not open and if I get anything in it come out all over the floor and my shoes. I take it I need some sort of a funnel the same size as a fuel pump

Thanks Steve

Something like this

http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_787569_langId_-1_categoryId_165581