webber

few weeks back i replaced the rubbish solex standard carb on my 1.3 8v as it was playing up ive put a webber 32/34 on more or less straight forward came to go for a run and was judgering wen u let it cost on the accelerator, and will only tick over solidly at 2k without the rev needle dancing all over,after doing sum prob finding, the old solex had a return line to the tank i think, this new webber doesnt so i blocked it up,  is that the right thing to do, or shall i put a T junction on it so the fuel tank can flow, any help would be much aprechiated  :cry: