I replaced the fuel line but I'm not sure how to replace the return line the hole is smaller & the line will not go in is there an easy way to do it?

Hi pennyreed try cutting your line at a sharp angle like to a sharp point and feed it through. Use needle point pliers to pull rest of way . Hope this helps. Have a good day . bullrun

Hi,
I agree! Cut like you wanted to make it look about like a chisel. Some machine do use two sizes of lines.
Peace,
Clarke