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Old 12-27-2019, 03:13 PM   #3
51 MERC-CT
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Join Date: May 2010
Location: Hartford, Ct
Posts: 4,711
Default Re: Fuel Evaporation or leakage from the carburetor

Does it go down any further than the needle valve inlet.
If it does then something lower than that level is the source.
If it does not go lower than the needle valve inlet there is a possibility that the fuel is being siphoned back into the fuel tank.
The fix for that is to insert a one way check valve in the fuel line
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