Re: [COUPERS] N2409H

[rblair]

I was reading the 'stromberg NA-S3A1 carburetor overhaul and parts manual' the other day and found this information on page 10.
" In certain installations a condition exists where the fuel level in the carburetor is above the present idle air bleed location.  While the airplane is parked, it is possible for the fuel to drain from the fuel tank, through the carburetor, and out of the idle air bleed onto the ground.  If the above condition is found, it is recommended that the location of the idle air bleed be changed as shown in figure 2-7."  The procedure is to redrill the idle air bleed hole slightly higher and plug the old hole.
This brings up some questions:  It appears from the drawings of the carb that if tail height were not right it could change the relationship between fuel level in the bowl and the location of the existing hole.  Has anyone given this any thought.  We have discussed causes of fuel leakage from these carbs but I don't recall this consideration.  I have not taken the venturi out of my carb body (the idle air bleed exits into the groove located on the outside diameter of the venturi) to locate the hole to see if it is on the side or front of the carb body so that I could understand the relationship between a high or low tail on this.  Next question is how high is the fuel level in the bowl?  If it is set too high, this could be a problem as it bring the fuel up to the air bleed level.
I am sure that this was reviewed by the designers and we do not need to redrill any holes for our installation.  But it is good food for thought.
Rich Blair
N99997  4J6
St. Marys, Ga.