Repairs Briggs and Stratton fuel tank thread sheared! Repair?

Hi all I am new.



I have a Sovereign SV405 lawn mower with a Briggs and Stratton 450 148cc engine.



The problem I am having is the bit of the engine (don't know what you would call it!) where the fuel tank screws onto has snapped in half or sheared off. I have tried using a nut and some cable ties but nothing I try will connect the petrol tank to the engine and it wobbles and rattles about. This has already snapped the intake manifold.



Is there anyway to repair this? I am not sure if it's safe to weld a nut onto it or something.



Any ideas?



Thanks



Malcolm