TT, you were absolutely right!  Initially I had just a drop of old fuel in a jerrycan.  When I topped it up a few days later, the fuel pump buzzed but didn't build up pressure.  I disconnected the pump outlet to help it prime.  It started circulating. When I reconnected the hoses, after a few attempts the engine started up and ran until I stopped it! 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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