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Mike V. Florida · 12-17-2018, 11:23 PM

Part of the Zenith design is the Gas Adjusting Valve (GAV), which provides a manual fuel adjustment for extra fuel from the main float bowl through the Secondary Well to the Cap Jet when needed. The carburetor was designed to be slightly lean to allow for high altitude driving and the GAV provided additional fuel. This extra fuel is needed at sea level, and even more so when the engine is cold.

12-17-2018, 11:23 PM	#5
Mike V. Florida Senior Member Join Date: May 2010 Location: South Florida Posts: 14,054	Re: Carb expert needed Part of the Zenith design is the Gas Adjusting Valve (GAV), which provides a manual fuel adjustment for extra fuel from the main float bowl through the Secondary Well to the Cap Jet when needed. The carburetor was designed to be slightly lean to allow for high altitude driving and the GAV provided additional fuel. This extra fuel is needed at sea level, and even more so when the engine is cold. __________________ What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II