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A problem can occur if the thickness of the washer under the float needle valve is incorrect, which in turn will make the fuel level in the carburetor float bowl incorrect. The fuel level effects the fuel level on the emulsion tube. The emulson tube works with the air bypass jet and seems to effect the rate of fuel vaporization. This means that the level of the fuel in the carburetor bowl is critical.
If the fuel level is a little low in the bowl (washer too thick), then facing downhill and cornering will cause the engine to run lean, causing stalling. Facing uphill the mixture would be a little richer - closer to normal. If the main jet in the carburetor is a little lean, that would make any bad fuel mixture settings even worse.
Following is a procedure for correctly setting the level of fuel in the carburetor bowl -
Position the car on a level surface (or, if the carburetor is removed from the car, place it so that it is level.
If the carburetor is installed, idle the engine briefly to ensure that the float bowl is full.
If the carburetor is not installed, fill the float bowl using a piece of hose attached to the fuel inlet pipe.
Remove the carburetor upper part and the gasket so that the fuel level can be measured.
The distance from the top of the carburetor body to the surface of the fuel should be 19.5mm +/- 1.0mm.
If the fuel level is too high, us a thicker washer under the float valve.
If the fuel level is too low, use a thinner washer.
Note: Washers are available in thicknesses of 0.50mm, 0.8mm, 1.00mm, and 1.5mm. Several sizes are included in the carburetor overhaul kit. The correct washer for the 34PICT/3 carburetor (per the overhaul instructions) is 0.50mm.