Thanks for the replys
The rate of fuel (2/5 of a bottle of wine) was cranking from the starter for thirty seconds.
I have spent the day cutting the end off frayed hoses (but no luck)
The hoses are not new but they are fair.
I take it from your replys that it is not normal for air bubbles to be sucked through.
The fuel was being forced into the carby at 4psi and held 4psi when i stopped cranking.
I will checkout the pump ant trap asap. However when i take it off will i need a gasket or Oring kit to do a propper job?
How does the water trap work?
Should it be emptied now and then?

Thanks Steve