Fuel Filler Point Leak

[brainbug007]

I tried putting some petrol in my tank tonight and it leaks at the filler point I've currently got a short piece of 50mm diameter tube (3mm wall) welded to the top of the tank, then a piece of fuel filler hose (http://www.cbsonline.co.uk/product/U...%22%29_FF F51) going between there and the filler cap (http://www.cbsonline.co.uk/product/8...y_Satin_AERO2). It's a fairly snug fit I thought as both ends of the hose are done up with clamps. When I fill it up it some comes out the bottom of the hose from between the hose and the steel tube welded to the top. I also went round the top of the steel tube with the welder to create a sort of raised section. Any suggestions as to how I can stop it leaking when filling up?