johno, ....here's a link to some tubing I've been using for a coupla' years, with GOOD success.

Link: http://www.jackssmallengines.com/Products/Universal/Fuel-Filter-Part/Fuel-Line-By-Foot

I've been replacing those "Dual Diameter" lines with a combination of the Black Echo stuff, and the Yellow Tygon, in a combination of diameters,...as someone's already mentioned, you simply slip fit them together until you've got a line that will feed or vent, leak free.

Hope this will be of some help.

Greg


Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain