I've never had a problem with the flip caps on my saws and trimmers, and like them better than the old style.  I've never had a fuel spray problem, but there's no denying the possibility after watching that video of the tree trimmer.  It could be a combination of shaking the equipment with a partially filled tank and then opening it.  I don't think I've ever opened mine in that situation, but I can understand the circumstances when that can happen.
	
		
			
		
		
	
				
			