Stihl 020T

flh69April 19, 2007

I have a Stihl 020T chainsaw that does not want to run when I open the throttle. I have cleaned the carb & put a carb kit & a fuel filter in it but it still will not take throttle. It acts as though it is running out of gas. This saw has a tank vent that consists of a fiber plug that goes into the top of the fuel tank and then a rubber "vent" that goes up inside of this fiber plug from the inside of the gas tank. It supposedly keeps the tank at a constant pressure. I had to order the rubber "vent" and have not received it yet. Could this be the problem?

If this vent does not cure the problem, does anyone have any suggestions? I am running out of ideas.


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Did you check the spark arrestor?

    Bookmark   April 19, 2007 at 8:25AM
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canguy(British Columbia)

Also check the fuel line, it may be cracked.

    Bookmark   April 19, 2007 at 9:04AM
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Thanks for the replies.
The spark arrestor is clean.
I have not checked the fuel line. Could that be checked by unhooking it from the carb & blocking one end & blowing air into it?
As I stated in my original post, I need to get a new valve, (part # 1110 353 1600), which I hope to have tonight. I'm hoping that will fix it but if it doesn't, I'm looking for other causes in advance.

    Bookmark   April 19, 2007 at 10:15AM
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How about the impulse line from the crankcase too the carb manifold? They have been known too slip off of their connections and cause similar symptoms.

    Bookmark   April 19, 2007 at 6:16PM
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I put a new fuel line and tank vent in last night and it is still the same. I saw the impulse line mentioned in the sevice manual and was wondering about that. The manual is vague about what the line does. I did notice that if I loosened the gas cap it would run maybe a little bit better.

    Bookmark   April 20, 2007 at 7:00AM
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The impulse line operates the fuel pump in the carb. As the engine turns the crankcase pressure fluctuates opening and closing the fuel pump flaps (and other things) with vacuum or pressure pulses.

    Bookmark   April 20, 2007 at 6:47PM
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How does it respond when you open and close the low speed adjuster? If no responce carb still has a little dirt in it. If it still has the epa tabs on the adjusters you might have to take them off to adjust it right. Steve

    Bookmark   April 21, 2007 at 8:59AM
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Thanks everyone. buttlint was right. The impulse line had come unhooked. I hooked it back up and BINGO! It runs like a top.
Thanks again. I was just about ready to take it to a shop.
Who knows what that would have cost.

    Bookmark   April 23, 2007 at 9:39AM
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I have a Stihl 020T with a broken chain-side cover (sprocket cover). Any idea where to find a used one?

    Bookmark   June 4, 2008 at 5:14PM
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masiman(z7 VA)

ebay would be about your best bet, even then I don't think you will have much luck. Those climbing saws end up with alot of broken and smashed parts :). I know my 020T has, lol.

    Bookmark   June 5, 2008 at 12:09PM
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I suggest getting rid of it, I have a 020t also and I find they are rather hard to keep running good. I prefer Husqvarna but if you don't have the money or don't need it for more then the odd job as a homeowner... arbouist chainsaws arn't worth it. If you wish to fix this problem you'll need to let it sit for a few hours because you might of flodded the engine, arbourist chainsaws are very delicate when starting up. After letting the gas flow go even, full choke it till it "cracks" or "pops"(sound)then half choke it and it should start right up. If this doesn't work only thing wrong with it I can think of is the gas hose lines. If they suck more air then gas it will blow apart your piston. Also make sure the gas/oil ratio is right and such. If this doesn't work let me know how this reacts and I'll help more.

    Bookmark   May 16, 2011 at 6:16PM
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