Thanks for coming back to me so quick, yes you are right it all starts to make sense, yes there were 2 holes in the rubber, carb and silencer, the third was not open, but I followed the instructions and I pushed the pipe through the rubber. The plane is a Ripmax Nova 40 -
I will have a look for a fueler valve, thanks again for your help. the last qustion is where do I install this pipe. Is it ok to leave it loose inside the plane...???

I tend to buy most of my stuff from
http://www.sussex-model-centre.co.uk/