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				On my 2004….
			 
			 
			
		
		
		
			….it was the valve on top of the tank, underneath the battery.  
 
 
It was a real pain to R&R, and then the replacement one failed six months later.
		 
		
		
		
		
		
		
			
				__________________ 
				550 SE #310---"It's more fun to drive a slow car fast, than a fast car slow."
			 
		
		
		
		
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