no problem there......
I always use the stock associated line,made by Dubro,Or aerotrend fuel line...(they both have the best grip,teh Aero is better)
Cut about a 1/4 inch of fuel line,and with a needle nose pliers,Expand it and put it over the regular fuel line..
Now,put on the regular fuel line,and push the small piece over the nipple also..it will hold the other fuel line on....