Re: 1929 640 fuel running out of the carburetor

Posted by Thomas Wilcox On 2011/3/3 16:39:26

EDIT: Somehow I missed ineffabill's comment! My comment below is largely redundant.

Hmm, this is a mystery. Just by chance, does your original system from this 640 work on the car you used as a donor for the current carb and vacuum tank?

I am not completely familiar with the 29 carb (my 30 has a Detroit Lubricator), but these ideas come to mind:

Does the car run normally? Or is it running too way rich? Are there any other conditions that would prevent fuel from being completely drawn into the cylinders? Maybe an intake valve or valves are not opening?

Are you getting fuel being drawn from the vacuum tank into the intake throat because of a wrong connection or too high a fuel level in the vacuum tank?

The only way the system can be over-pressured is if the vacuum tank fuel level is too high, or for some reason the vertical distance between the tank and the carb inlet is significantly greater than normal. After all, gravity isn't just a good idea, it's a law.

If you solve the problem, please let us know!