Stihl 260 Runs then dies

[SmokingAndPoking]

Stihl 260, I was cutting and the saw acted like it was starved for fuel and quit.

I've tried:

Fresh Gas + Oil [50:1, ethanol free]
Rebuild Carb
Replace Tank Vent

If I open the tank filler cap and then close it the saw will run for longer. If I run the saw without the tank vent in the hole it will run fine. I figured replacing the tank vent would fix the problem, but it persists.

Is there something I'm missing or something else I need to check? Could the pulse line from the crankcase be jammed up and when the vacuum in the tank builds it prevents the fuel from being pumped to the carb?

Please help!

[I posted this on the Arborist website too, but I thought I'd get opinions here too]

 

[smokinj]

Impulse line my best guess.

 

[taxidermist]

I would say tank vent is plugged. Can you tell if the vent is working?

Rob

 

[SmokingAndPoking]

I'm going to go check the new one now. I guess if I blow in the cap I should feel air on the other side?

 

[mking7]

I would say tank vent is plugged. Can you tell if the vent is working?

Rob

Sure sounds like tank vent to me.

 

[SmokingAndPoking]

I know, me too. But the one I put on is brand new. I just got back from the Stihl dealer.

 

[MasterMech]

I'm going to go check the new one now. I guess if I blow in the cap I should feel air on the other side?

Now your cooking with gas... Should let air IN, not out.

 

[HittinSteel]

if the vent and impulse check out, try a new fuel line

 

[Angelo C]

I'm thinking fuel line as well. Vac test it and see if it collapses around 8-10psi.

cost of testing rotten bubber hoses....priceless.

 

[mikefrommaine]

if the vent and impulse check out, try a new fuel line

My 029 did that when the fuel line rotted through.

 

[taxidermist]

did you figure it out yet?