Hmm, I think I saw a fuel cap that is also a vent built into it, but I'm not sure. Check google or wait for Spareparts  
Hey Charlie I'm not on Facebook anymore, I don't know how to delete my Facebook so I unfriended everyone,  
The best thing I did.  Why don't you try running it on a portable fuel tank? That will narrow it down . If it still callapsing then the primer ball is the enemy.
		 
		
		
		
		
		
		
			
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