Husqvarna 324L Workshop Manual page 48

Increase and de- Cause:
crease engine speed
The engine speed The fuel filter is blocked.
cannot be increased.
The fuel hose is blocked.
There is air in the fuel pipe.
There is vacuum pulse leakage.
The vacuum pulse pipe is blocked.
The screws on the pump cover are loose.
The pump diaphragm is defective.
The needle valve is defective.
The carburetor is not installed correctly.
The heat insulation seal is defective.
The needle valve lever is damaged.
The needle valve lever is too low.
The needle valve lever does not operate cor-
rectly.
The needle valve spring is not installed cor-
rectly.
The control diaphragm is damaged.
The needle valve is blocked.
The engine stops The pump diaphragm is defective.
when the engine
The needle valve lever is too high.
speed is decreased.
The needle valve lever does not operate cor-
rectly.
The needle valve is worn.
There is an object in the needle valve guide.
48 - Troubleshooting
Action:
Clean the fuel filter. Replace the fuel filter if it
is necessary.
Clean the fuel hose. Replace the fuel hose if
it is necessary.
Use the air purge bulb to remove the air from
the fuel hose.
Examine the pump diaphragm and the pump
diaphragm gasket for wear and damages.
Replace defective parts. Refer to
semble and assemble the carburetor on page
22 .
Clean the vacuum pulse pipe.
Tighten the screws on the pump cover.
Replace the pump diaphragm.
Replace the needle valve.
Install the carburetor correctly. Refer to
move and install the carburetor on page 19 .
Replace the heat insulation seal.
Replace the needle valve lever.
Adjust the needle valve lever.
Examine the needle valve lever. Replace the
needle valve lever if it is necessary.
Install the needle valve spring correctly. Refer
To disassemble and assemble the carbu-
to
retor on page 22 .
Replace the control diaphragm.
Clean the needle valve.
Replace the pump diaphragm.
Adjust the needle valve lever.
Examine the needle valve lever. Replace the
needle valve lever if it is necessary.
Replace the needle valve.
Clean the needle valve guide.
1218 - 001 - 01.07.2019
To disas-
To re-