From experience, the clicking is the fuel pump experiencing a dry condition. May be you have a partially plugged fuel filter. When was the last time you changed it?
The smell can be lots of things. Any little leak can be smelled more when you stop. Mine acted exactly as you are describing when a floatdidn't float any longer. Shortly after replacing that one,I started smelling it again and, again, it wasa float that didn't. At that point I replaced them all.