I think I made a post on this about eight years ago!
This is a prime example of the fact that if a hard and soft material rub together in a dirty environment, it is the hard material that is worn (grit embeds in the soft material and it acts like a file).
In my case a local brake specialist cut the line, flared the ends and put a joiner in. 
I suspect the problem starts when you replace the rubber section that joins the nylon line to the metal stub at the injection pump, and don't get the length exactly right. 
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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