I will double check the rubbers and clamps. With vacuum pipes, do you mean the ones from the inlets? The funny thing obout those is that if you connec these to the morgan carbtune, the bike will stop after a short while. then you have to put one of the pipes back on the vacuum pump. start it up and then reconnect the carbtune again.
Is it suppose to be like this?
'a short while'...how long ? If you disconnect the pipe from the pump then there's no fuel going to the carbs and you are just emptying the float bowls. Having said that it doesn't sound short of fuel when you rev it........but, you have also moved the tank, do you know if the tank filters (internal on the pipe connection) are intact, perhaps moving the tank has disturbed dirt which is now in one of the jets ?