hello sir, fuel line replacement, for chainsaws. it is very important to use the same fuel line,O.D. & I.D.. you will need about a 1 ft. of each. line with filter to carb inlet. line from carb goes to inlet side of bulb. line from bulb goes to tank. make note where large I.D. line goes to primmer bulb. a new filter would be a good ideal. how i feed new fuel line through fuel tank cut line at a angle grease or oil line feed a little at a time pushing with fingers untail you can grasp with needle nose plires and pull through,it is a time consuming thing there is no other way that i know of. hope this helps, MrFixIt, oh could you please rate this solution, thank you.