Carburetor Leaking Fuel

A

Angelo

Junior Member
I am currently trying to figure out a carburetor problem on a 29 town sedan. The carb does not leak at all cold, but as soon as you drive it, it starts acting up. it seem to run way too rich, not wanting to idle, and stalls if you dont have the idle lever turned up. When I shut the car off there is fuel leaking (possibly boiling) out the vent below the air mix screw. Any help will be apreciated, at this point I don't know where to start.
 
Is there supposed to be a gasket between the exhaust and intake manifold to prevent heat transfer?
 
:cool:sounds like the float level is to high, it takes more fuel to run when cold, less when hot,, check the needle and seat for wear, or the float is set to high:rolleyes:
 
The needle and seat are new and I'm pretty sure the float is set right. Also the fuel appears to be bubbling out the vent. If the float was set wrong wouldn't it leak any time the gas valve is turned on?
 
the engine viberation could cause the carb to flood if the float is set to high, and yes if the carb gets to hot the gas will boil out, double check float level first, there is a thin gasket between the carb and intake manifold
 
There is no gasket between the intake and exhaust manifolds. Since most of us drive only in the summer, it seems to me that it would be a good idea to have a gasket at this location. You would need to machine away some metal so that the two pieces would match up correctly with the gasket included. An alternative to a gasket would be to machine away about 90% of the contact area (remove less than 1/16 inch) leaving 10% untouched.
 
It is possible the brass float has a leak that permits partial filling with gas. You can set it to the correct height but it sinks partially. It may float enough to shut off when stopped, but when running it craps out. Either try another float or use an actual "U" tube to see the carb fuel level when running. You can buy a cheap kit from a catalog supplier to do this by temporarily replacing the lower screw-in jet plug, or rig your own.

Here's a pix from Snyder's catalog, $5.95, part #A-9599
A9599-7462.jpg


New float if you can't fix the old one, $19.50, part #A-9550
A9550-7452.jpg
 
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