[T3] Weber Carb update

[James Lingenfelter]

I'll have to do a little research on the fuel hose and make sure I'm  
getting the right thing.

It is definitely humid here on the Gulf Coast.... 90% on a daily  
basis, so I guess that explains that. It's just strange I never  
noticed it before; especially considering how much time I seem to  
spend in the engine compartment on that car. There is no pre-heating  
setup, since this car has aftermarket short intake manifolds- I think  
they are CB Performance.

On Jul 14, 2012, at 11:19 AM, Jim Adney wrote:

> On 14 Jul 2012 at 12:01, James Lingenfelter wrote:
>
>> The fittings in  the carbs are NOT loose, the fuel hoses are simply
>> loose on the  fittings, and no amount of tightening (or  
>> overtightening
>> for that  matter) of the hose clamps will secure them. I still have
>> fuel  seeping through at the connections. I just replaced these fuel
>> lines  a few months ago with the highest quality hose I could get.  
>> The
>> fittings on the carbs are the type that have one rounded "barb" at
>> the end of the fitting.
>
> You may need to check what diameter of the hose you are buying. Yours
> is either too large or it was old and hard when you bought it. New
> resilient hose should seal without clamps on a nipple like that. At
> this low pressure, the clamp only serves to keep the hose from
> falling off.
>
>> Also, still related to the Weber carbs: The last couple of times I've
>> had it running in the garage, within just a few minutes of running, a
>> lot of moisture is forming around the driver side carb, mostly near
>> the base it appears. When I first saw this, I thought I had a fuel
>> leak somewhere, but it is apparently water.... quite a bit of it....
>> enough to be running down the intake manifold after 5 minutes of
>> running. What could this mean? Is something happening to cause a lot
>> of condensation to form on the outside of that one carb?
>
> Yes, the air passing thru the Venturi is expanding and the gas is
> vaporizing, both of which cause cooling. I'm guessing that it's humid
> where you are, and the cooling is causing the carb to cool down below
> the dew point. If you looked down the throat of the carb, you'd
> probably see the same thing happening on the inside.
>
> In extreme cases, the condensed water will freeze. When it happens
> inside the Venturi, it constricts airflow and slowly reduces engine
> power. This is known as carburetor icing and is something that
> aircraft have to be very careful of.
>
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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