Husqvarna 50 Workshop Manual page 42

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Assemble the fuel pump section. Press the fuel inlet
screen into its seat evenly. Install the fuel pump
diaphragm against the carburetor body first, followed by
the gasket and cover.
After assembly, pressure test the carburetor for air leaks.
Pressure test at 50 kPa (7.2 psi). No air leaks are
permitted.
On carburetors equipped with choke valves, check that
the levers of the fast idle system are not worn and that
they have positive engagement.
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