Might just be a breaking-in issue? What size is the output pipe, if it's something like 1" maybe you can replace it with a slightly longer pipe .. or maybe think about pulling it and replacing with the gate valve .. It's a pretty easy mod (usually) and gives you more control over the water level. The hard part is finding the gate valve! 
		
	
		
		
		
		
			
				__________________ 
				 -- Tony 
 My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills.  Whee! 
 
			 
		
		
		
		
	
		
		
	
	
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