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Old 05-02-2013, 02:57 PM
4slservices 4slservices is offline
LawnSite Member
Join Date: Feb 2013
Location: Baltimore
Posts: 46
Stihl KM 90 leaking fuel into air filter

I have 3 Stihl KM 90s. They are the same engine as the FS 90 trimmer. This problem has happened to the 2 older ones. Gas leaks into the air filter when not in use, no matter which way trimmer is positioned. I ordered a new carb and its still happening. Could it be the gas tank vent? Is there a way to clean them or do I just have to buy a new one. Anyone have this happen to them. Its starts and runs just fine without a gas soaked air filter on it.
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Old 05-02-2013, 03:44 PM
ricky86 ricky86 is offline
LawnSite Bronze Member
Join Date: Aug 2008
Location: Monmouth Cty N.J.
Posts: 1,619
If you're sure it's not the carb, then yes it's the vent. You might see it leak. Turn it upside down and watch the little port in the a/f base.
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gas leaking , stihl km90

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