I recently noticed something that I hadn't noticed before that may actually be normal. If I actuate the throttle and squirt fuel with the accelerator pump by hand on my 67 327/300 with Holley carb without the engine running, some fuel weeps out the throttle shaft on both sides. I have recently rebuilt the carb with a Holley kit, and there are no seals on this shaft and Holley does not recommend disassembly during rebuild. I am assuming that since the engine is off and there is no vacuum inside the carb, that the abundance of fuel sitting inside has no where to go and is drawn out the baseplate throttle shaft by capillary action. With the engine running I don't see any leakage. So, should I just consider this normal?
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Re: Weeping carburetor
Tim,
The more play you have in the throttle shaft/throrottle body the greater the chance of fuel weeping in that area. I do not know the degree of play the is considered normal but I'm sure someone else here will let us know. If that is the only time you have a leak and the car is running fine I'd consider yourself lucky. Holley carbs do have a history leaking issues.
Wayne -
Re: Weeping carburetor
Tim - Although the leak may be aesthetically annoying, it won't cause a problem. When the engine is running, the throttle body is in a low pressure area of the intake system and that will cause a very small amount of air to travel from ambient air pressure throuh the body/shaft gap into the carburetor. It won't be possible for fuel to travel from the low pressure area through the body/shaft gap to the higher pressure area. Technically the engine will run a tiny bit lean, but not so much as it will matter. BobComment
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