I’m not against them, but I filter in and out but run a PSP clunk to carb unrestricted.

The Tilitson "pelt" clunk's don't release fibers - different material to the walbro felt clunks
The Tilitson uses a "pelt" material not felt , the pelt material is a tighter natural fiber
The alloy cast carrier is also cleaned up by opening up (drilling) the center hole , the casting process leaves a part line down inside in the fuel nipple and a chance of restriction or piece break-away

This is a standard Husqvarna chain saw fuel clunk/filter. I have been using solely these for over a decade. Less flow resistance than felt clunk. Sips fuel even if only a part of it touches the fuel. The largest engines using this at our field are ZDZ-224, DA-200 and Moki 250.

--kaboomski;

Yep, ceramic is the ticket

I tried the ceramic, It had way more increased resistance to fuel flow than the felt. It was a quite shocking. Night to day difference. And, dumb dumb me did not figure it out til later that it was the ceramic filter taking the engine out of tune (lean).

Originally Posted by orthobird

I tried the ceramic, It had way more increased resistance to fuel flow than the felt. It was a quite shocking. Night to day difference. And, dumb dumb me did not figure it out til later that it was the ceramic filter taking the engine out of tune (lean).

Interesting......we use ceramic on all our planes, with great success....in fact, Viton and ceramic clunk is all we use.
In fact, I even the resistance on this filter by pumping smoke oil (much thicker than gas) through it: the pump did not even slow down.

It would be pretty simple to measure the flow. Put the tank on the table and with a stop watch and using gravity, see how long it takes to fill a cup.

Originally Posted by ghoffman

It would be pretty simple to measure the flow. Put the tank on the table and with a stop watch and using gravity, see how long it takes to fill a cup.

Good idea, I will try that!

Doctor, I am certain you can find a suitable hemostat to clamp the fuel line...

but for that he would need a nurse

When should Viton be used over traditional lines?

Use Viton inside the tank. It will not harden or decay over time.

I say three to 4 years.

Tygon hardens after 1 season

Never use Duprene rubber for a fuel line, they crack over time

Originally Posted by Vapor Trails

When should Viton be used over traditional lines?

Always. Only downside is it is opaque.

Originally Posted by orthobird

Use Viton inside the tank. It will not harden or decay over time.

I say three to 4 years.

Tygon hardens after 1 season

Never use Duprene rubber for a fuel line, they crack over time

Originally Posted by ghoffman

Always. Only downside is it is opaque.

Thank s guys.
Are there any reasons not to use Viton all over (not just inside the tank)?

Are there any scenarios when you would not want to use Viton?

Originally Posted by Vapor Trails

Thank s guys.
Are there any reasons not to use Viton all over (not just inside the tank)?

Are there any scenarios when you would not want to use Viton?

All my non viton external lines are still pliable after years of service.
Not sure there is a viable reason to use Viton everywhere but its an individual choice of course.

Since I replace clunks every year, I still use good ol Stihl or Oregon Tygon in the tank. Keeps me from becoming complacent about replacing the felt clunks each season.