Question about Husqvarna Chain Saw 20" Bar

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Husqvartna Gas Vent

My husqvarna would die when i pressed the throttle so I ran it with the gas cap off and it worked fine.  I think that the vent is clogged but I don't know where the vent is located (doesn't seem to be in cap).  Any suggestions?

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Most husqy gas tank vents are on the same side of the tank right where the fuel lines enter the tank.

Posted on Mar 01, 2009

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Hi

First check the fuel filter ,inside of the gas tank:After that, try to find out where is the airating sistem(gas tank vent):For example a hose with a sprig into it,or any other sistem. Check it.

best regards savumihai71

Posted on Dec 10, 2008

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1 Answer

Stops running then will not restart


need more info. It sounds like it does run or you would have stated it stopped working and will not work anymore. I need more info please.
When it stops is it because you gave it the throttle and it quit or does it just up and die as if it ran out of gas in which case it will sputter first or does it run then instantly start to stop then instantly run again. What I can do at this point is give you somewhere to start. Number one the on off switch can be faulty and will cause it to start to instantly die and then immediately run again and also maybe go dit-dit-dit-dit while running like it was skipping or sputtering. How old is this saw? Inside the fuel tank is a filter. If you take a flashlight you will see it. reach in with something and pull it out with the hose. be careful not to damage the hose. Remove and replace the filter. If it runs good til it gets hot and if you loosen the gas cap it takes off running again, replace the gas cap as the vent hole is plugged. So if can reply back with more info.

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1 Answer

Starts fine, run fine,for about 2 to 5 min.,then cuts off,sounds like it's not getting the gas.


I have a Husqvarna 125B same problem. Turned out to be a bad gas cap. Doesn't vent properly and starves the engine. I took the gas cap off of my Huqvarna weed eater and put on blower and blower worked fine,

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Can get gas to motor changed filter


try and run it with the gas cap loose there is a vent in the cap that can get plugged up (think of putting your finger on the top of a straw)

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1 Answer

When saw is running it dies unless i undo the vented gas cap then the saw will keep going is there any other way on other than the gas cap for it to vent or help breath? on a 372 xp


The vent on the 372 is not in the cat, it is situated on the right hand rear side of the fuel tank, the early vent was a black pipe pressed into the tank with a white ( vion ) plug in it, this can be pulled out by screwing a self tapping screw into the middle of it and pulling out with a pair of pliers, the later breather is in the same place but consist of a green valve pressed into the tank, it then has a black pipe conected to it which comes up into the crankcase and sits onto a nipple under the air filter, this can be pulled out with a pair of pliers and replaced, the later breather is very prone to blocking, due to CE law and gas escape from fuel tanks the breather is very fine.

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1 Answer

Stihl MS290 only runs if the gas tank vent valve is removed, then it runs. also when after cutting a full throttle upon release chain saw does not recover to an idle but dies. Have put in new carb. and new...


sounds like you have a plugged vent either in the gas cap or the vent valve of which you speak. Without the vent working properly, the engine running and drawing gas from the fuel tank causes a vaccum inside the tank making it harder for the fuel to draw to the carburator. this would cause the symptoms that you are talking about.

Replace the gas cap if it is vented or check to see if the vent valve you mention is working properly.

Good Luck

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1 Answer

Wont run for long


Without know the model number, I couldn't say. You could go to.. http://www.partstree.com/parts/ click on Husqvarna, then enter the model number on the left. That will bring up the diagram for it. It may have a duckbill valve inside the cap or an external vent elsewhere.

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My ryobi will start but dies about 5 minutes later


Try running the machine with the gas cap loose. There could be pressure builiding up in the system due to the cap being too tight. There is no vent on these systems like an automobile. If the gas cap is overtightened this could be your problem as the cap is equipped with a gasket that allows the vapor to vent through the cap. Overtightening could be sealing off your vent

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My 372 xp did that and when I talked to the repair shop they even showed me. There is a fiberglass gasket that is used to mount the carburetor to the engine. I have no idea on how this happens, but I saw it with my own eyes. The gasket had actually folded over. They replaced it with a rubber one and have had no problem since. The saw was hard to start, would run as long as I didn't try to cut anything and when I did it would open up and then die. I could be giving wrong information, but that sounds exactly like the problem I was having.

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