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		Mine does the exact same thing.  Its the tube vibrating and the dipstick moves up a little. 
 
You can add another bracket/clamp to the tube, or increase the tension of the clip or just shove it back periodically. 
		
	
		
		
		
		
		
		
			
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				Warren 
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
			 
		
		
		
		
		
		
	
		
		
	
	
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