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Re: Failed Emissions test- CO was too high. What now?
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Originally Posted by Fausto
I switched the petcock to prime and it ran fine. What does that mean?
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Sounds like you're not getting the vacuum that's needed to open the petcock in "run" & "reserve" ("prime" doesn't need a vacuum) Check the vacuum pipe that goes from the engine to the petcock for splits & tightness. 
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