The Ford Barn

TAG29A · 06-20-2015, 05:20 PM

My brother is helping a friend get a 29 roadster running. It has a zenith carb, and was leaking gas allover like the float was stuck. He ordered a rebuild kit from Snyders and got the better needle and seat. Rebuilt the carb, had the float adjusted correctly, and he is still having gas flowing out of the carb. Any advise would be appreciated as we are both stumpted!!

Thanks!!

stewwolfe · 06-20-2015, 06:35 PM

Is the car sitting level? If the front end is raised up it will cock the carb back and allow fuel to flow out the air intake. If the car is level then either the float is set too low (and not closing the valve before gas can flow out the air intake) or the valve isn't closing. Make sure the valve really seals when the float pushes up against it.

Mark in MT · 06-20-2015, 06:46 PM

Check to see where the gas is coming from, inside the throat or from the outside of the carb. One quick thing to check is to see if the float is full of gas and not closing the valve. ( This makes it a sink, not a float. ) Short main and cap jets coupled with high float level will make them leak.

Mike V. Florida · 06-20-2015, 10:09 PM

Take off the bottom of the carb. Replace the bottom with a baby food jar and see the float and valve in action.

Ron in Quincy · 06-20-2015, 11:43 PM

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The Main and cap jets, if not tight, will sometime leak at the bottom of the jets. When rebuilding a carb I put a small amount of Form-A-Gasket sealant liquid, using a toothpick, on the gaskets before installing to be sure they will not leak at the bottom; I also use the sealant on the gaskets on the float valve, compensating jet, screen and plug below the main jet.

Ron

06-20-2015, 05:20 PM	#1
TAG29A Junior Member Join Date: May 2012 Posts: 12	Zenith carb help My brother is helping a friend get a 29 roadster running. It has a zenith carb, and was leaking gas allover like the float was stuck. He ordered a rebuild kit from Snyders and got the better needle and seat. Rebuilt the carb, had the float adjusted correctly, and he is still having gas flowing out of the carb. Any advise would be appreciated as we are both stumpted!! Thanks!!

06-20-2015, 06:35 PM	#2
stewwolfe Senior Member Join Date: Jun 2010 Location: North Chesterfield, VA Posts: 299	Re: Zenith carb help Is the car sitting level? If the front end is raised up it will cock the carb back and allow fuel to flow out the air intake. If the car is level then either the float is set too low (and not closing the valve before gas can flow out the air intake) or the valve isn't closing. Make sure the valve really seals when the float pushes up against it. __________________ '31 40B '31 68C

06-20-2015, 06:46 PM	#3
Mark in MT Senior Member Join Date: May 2010 Location: Western MT Posts: 218	Re: Zenith carb help Check to see where the gas is coming from, inside the throat or from the outside of the carb. One quick thing to check is to see if the float is full of gas and not closing the valve. ( This makes it a sink, not a float. ) Short main and cap jets coupled with high float level will make them leak. __________________ Mark in MT Always looking for another opportunity to be wrong.

06-20-2015, 10:09 PM	#4
Mike V. Florida Senior Member Join Date: May 2010 Location: Florida between Sarasota and TampaSouth Florida Posts: 14,054	Re: Zenith carb help Take off the bottom of the carb. Replace the bottom with a baby food jar and see the float and valve in action. __________________ 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

06-20-2015, 11:43 PM	#5
Ron in Quincy Senior Member Join Date: May 2010 Location: Quincy, CA. Posts: 1,708	Re: Zenith carb help Sponsored Links (Register now to hide all advertisements) The Main and cap jets, if not tight, will sometime leak at the bottom of the jets. When rebuilding a carb I put a small amount of Form-A-Gasket sealant liquid, using a toothpick, on the gaskets before installing to be sure they will not leak at the bottom; I also use the sealant on the gaskets on the float valve, compensating jet, screen and plug below the main jet. Ron