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#6:  Q: What's wrong with this picture?

Answer:
   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.

Solution:
   Complete teardown of fuel pump and carburetor.  Install new fitting without RTV.  Don't use RTV on any fittings.