Chainsaw Repair

I have getting knee deep here in my projects( SAWS). I have 3-2050's 2-2045's and a CS2152. I would like to replace all the old black fuel line to new tygon lines on this saws.. Please don't ask how many saw I own..LOL. My basement is full of jon's, poulan,homelites,husky and sthils So what size of fuel line do them jons 2050's.2045's and my CS2152 take .80x.140 or ??.All of them have bad fuel lines from when I got them. Now snice things are slowing down at home now days.My boy is headed off the navy this fall.So our plan is to get most of them going like new and use them for cutting up wood for our wood burning for my wife and I to heat the barn ( old Farm House).Plus teach my son a thing or too about saws.I have a jony dealer I go too 40 miles away I buy saws that need little work for 50 bucks or a top end free no charge for the saw.I go threre every 3 months come home 3-4 saws. I have alot of places I go to pick up fixer uppers and I love working on them a lot (hobby) .. Wife calls it a money pit..lol. . I'm like  ..lol

Please help on what tygon fuel line size I should order for my jonys.


Thank you for your time
Jason

why won't tygon work long term and on impulse lines...OEM is junk IMO, so you suggest to just keep changing it? PITA
Vitron? is that what we call Viton, pretty dear if its the same thing we use in industry.

All petroleum,caustic and acid designed diaphragms and shuttles in pumps and valves are made from Teflon, has anyone seen Teflon tubing?

Anyways off to dealer ($$$$) to get a fuel line on my 346 replaced. 1 tank cuts about 4 wheel barrow loads of wood and my right knee is soaked. It really streams out when you pump the primer bulb.
The price you pay to save the planet and let farmers afford to eat I guess.

The tygon lines don't like heat, get soft and collapse or blow right off. The link above will get either type viton or rubber. You can also use dolmar fuel line red stuff quite good. Do not know what it is made of but works great, sometimes called ps-421 fuel line, 1 meter for 6-12$ depending on source. And you are correct is is 'viton' my fat fingered mistake!

This is Dolmar 965452660 impulse line that comes in a one meter length. It is a muted dull red color. I've seen various prices from $6 to $12. It will probably last you a life time for impulse hose. Stamped "EPA-M6X-FA"

I think all of the Tygon formulas carry a "U" rating (not recommended) for gas, alcohol, aliphatic hydrocarbons. Impulse lines certainly get their fair share of fuel spray

Interesting!  mfg uses a 28 day immersion test at 73 degrees for the basis of their compatibility recomendations. Seems ok with alky/nitro, although it tends to swell in my experiences. I've had better luck with silicon based hose for alky/nitro