For the carburetor to work these pressures must be equal.
Chainsaw fuel cap vent.
If the tank can.
If you are running a vent line it is important that the line is ran higher than the highest point on the tank including the fuel filler neck.
This is simply a gas cap with a hole in it.
Also the vent line cannot have a dip in it where fuel or.
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When the gas inside your stihl chain saw fuel tank heats up it creates pressure inside the tank.
When the gas inside your stihl chain saw fuel tank heats up it creates pressure inside the tank.
It is also designed to vent excess heated gases to keep the right amount of pressure which allows the fuel to be pumped into the carburetor via the fuel line.
Unfortunately this hole would allow the fuel to splash out when accelerating or turning a corner.
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These gas caps can get dirty or damaged when you stop to refuel in the field.
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The gas cap on a poulan chainsaw covers the tank and keeps gas from spilling while you cut.
How to clean a vent cap on a stihl chainsaw.