Not sure if its the "correct" way, but I use a large screwdriver and hammer and gently tap the ring around. Tap a bit on one side, then the other.
No dramas the couple of times I've had to do it.
If the connection on the new unit is the same diameter as the plastic fuel line then a bit of rubber fuel hose and some hose clamps should do the job nicely.
If you're concerned about the rubber not sealing on the plastic hose just make the overlap a bit longer and put 2 clamps.
Steve
				
			 
			
		 
			
				
			
			
				1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
			
			
		 
	
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