#6: Q: What's wrong with this picture?
Used RTV on fuel inlet fitting at mechanical fuel pump, probably because they had an issue with it leaking and didn't think to replace the O-ring. Once that red stuff breaks loose and goes through the carburetor...well you know the rest (involves the engine getting quiet).
Note broken-off piece of RTV inside fuel pump in bottom image.
Complete teardown of fuel pump and carburetor. Install new fitting without RTV. Don't use RTV on any fittings.