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Just converted 74 spider to webers. Rebuilt the carbs, car starts right up but I am getting some gas leaking down the venturi's. anybody else have this problem and know what is wrong.

Thanks
Ed

Using facet fuel pump for carbs
 

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The venturis in my Webers are always a little wet after it has been running. My fuel levels are correct and my fuel pressure is 3 psi which is as low as is practical. I have to use part throttle to start the car when it is hot but everything else is fine. I have concluded that it is the way they are. The Alfa Air box has a drain orifice which I presume is to get rid of small amounts of gas that settle in it.
 

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Where did you connect the orifice(drain) to
It doesn't connect to anything. That is how it is shown in the official literature.
 

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Drain orifice

Here is the orifice. The diameter is 1mm
 

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Hello,

As said previously, airbox should be dry if everything is fine ...

Already had the same problem as described
Reason was a loose fuel inlet valve leading to overflow in 1 of the carbs

As a starting point, you should check actual fuel level (vernier caliper method), not rely on 'float adjustment' described in most of the manuals with distance between brass float and cover base, which provide only a rough approach.


Best regards
Sébastien
 
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