Locate the tank vent on the fuel tank s nipple just to the left of the rear handle and beside the starter cover.
Chainsaw fuel tank vent.
Pry off the tank vent with a pair of needle nose pliers pulling it away from the fuel tank s nipple.
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.
Work in a well ventilated area when installing this part.
The vent in location on the rh side of the fuel tank.
See area circled in orange.
Fuel tank vent 501152901 allows air to enter the fuel tank for proper fuel flow.
In order to replace the vent you would need to remove the fuel handle assembly.
Drain the existing fuel from the tank and disconnect the spark plug wire before beginning the repair.
This fuel tank vent part number 501152901 is for chainsaws.
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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.
The chainsaw in this video is a sachs dolmar 120.
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How to make hack a gas tank vent line for a chainsaw.