Chainsaw Repair

I've never had much luck in finding small enough lines to use on a chainsaw .I have used a hodge podge collection of old vacuum lines I saved off of junked out cars .I can't tell buna from rubber .The only way I ever knew if it would hold up it wqs to toss a chunk in a can of gas for couple of days .If it was buna n it would be okay ,if not if it became mush .

I'm sure you could probabley find it if you wanted to spend a couple hours in google land .