In order to replace the vent you would need to remove the fuel handle assembly.
Chainsaw fuel tank vent.
The chainsaw in this video is a sachs dolmar 120.
This fuel tank vent part number 501152901 is for chainsaws.
How to make hack a gas tank vent line for a chainsaw.
For husqvarna craftsman.
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It depends on what model we are talking about on the hobby saws 137 142 235 240 it is a duck bill valve witha sintered plug above it the bigger saws either have a white plug vion this is a porus material and very rarly blocks the latest machines have a white valve pressed into the tank on the r h side of the saw this vave has a nipple on it some machines have nothing connected to this and some machines have a pipe which goes to atmosphere.
See area circled in orange.
Locate the tank vent on the fuel tank s nipple just to the left of the rear handle and beside the starter cover.
Pry off the tank vent with a pair of needle nose pliers pulling it away from the fuel tank s nipple.
Drain the existing fuel from the tank and disconnect the spark plug wire before beginning the repair.
Podoy fuel tank vent line for compatible with stihl 021 023 025 ms250 028 029 ms290 038 048 chainsaw rep 1117 350 5800 pack of 2 4 7 out of 5 stars 130 5 99 5.
Hifrom 3 x fuel tank vent line replacement for stihl 021 023 025 028 029 038 039 048 ms250 ms290 chainsaw 1117 350 5800.
Work in a well ventilated area when installing this part.
Podoy fuel tank vent line for compatible with stihl 021 023 025 ms250 028 029 ms290 038 048 chainsaw rep 1117 350 5800 pack of 2 4 7 out of 5 stars 133 5 99 5.
Step 3 pull the tank vent out of its seat in the handle housing and remove the tank vent and its hose from the saw.
Fuel tank vent 501152901 allows air to enter the fuel tank for proper fuel flow.