Hello everyone, I'm new to the Model T world and am having some trouble with the atmospheric valve leaking gas once the fuel line is open. Carb has been recently rebuilt with new gaskets. Any suggestions??
RE atmospheric valve leaking gas? I think I know what you are asking about but you are using unknown descriptions of parts.
The illustrations in this postings will give you the correct terms.
In illustration number 98 on the above link, the part labeled "M" as atmospheric valve to float is where the gas is coming out of.
The only way fuel can escape from the vent (M) has to be due to flooding. Check the gasket under the seat, the sealing of the needle in the seat, and the float for leaks as any one of the three will allow flooding. Good luck :Bruce
It must have been flooded. I shut off the fuel valve and started it to let it run out of the gas that was left in the carb and the lines, after that it's not leaking anymore. Thanks for the help.
Sounds to me like there might have been a particle of dirt or rust in the float needle valve (K) on your diagram. When you ran all the gas out, the particle left the valve and so the dripping stopped. It's always good to close the main gas valve at the sediment bowl when you park the car in case there might be an unexpected leak at the float valve while parked. A very slight leak there can drain the tank and if parked indoors could cause a fire hazard.
I took the vaporizer off my 27 and put a NH on no issues with faster starts and smoother driving power. Mine was rebuilt but I didn't have the knowledge to make it run correctly.
I have ran two different types of vaporizers on my Tudor sedan and have had great luck with both of them. I ran a Holley with an Atlas manifold for ten years and am now using a Kingston. The Kingston has more power, but is difficult to start, hot or cold.
It sounds like your problem is solved; however, it is extremely important that the float level is set correctly (3/16"-1/4") and that the needle, #6220, is moving up and down freely. Debris from the tank can plug it quite easily. If you haven't flushed your tank, now might be a good time to do so and to make sure the fuel bowl screen doesn't have any holes in it. For peak performance, make sure that the adjustment needle tip, #6279, isn't blunt and that it seats well in the brass seat, #6283, which is screwed into the cast iron assembly. PM me if you run into any issues.