Briggs and Stratton carburettor

[singlepentode69]

I see the filter in the fuel tank is not blocked is it they sometimes have a wire mesh filter inside the tank sometimes fitted to the tap.The other things that stop the fuel getting to the carb is a small hole in the fuel pipe which seems normal when removed from the carb ie fuel goes through but when the pipe is fitted back on the hole sucks air in and causes an airlock I had this on a ransomes you could hardly see the hole.
Regards
Robin