Thanks Iain. After filling the tank, petrol did appear to flood between the join on the bowl. On the underside of the bowl is a screw head and a smaller screw with spring. Without fully removing the carb, can i undo the larger screw to remove the bowl, will this reveal a split diaphragm ? I just need to understand why petrol is being lost this way. Many thanks for your help so far.
wayne
April 2009