Husqvarna K970 III Workshop Manual page 35

6.5.8 To remove the filter for the fuel tank venting
• Remove the check valve and then the filter for the
fuel tank venting with a pair of pliers.
6.5.9 Function of the air purge bulb
A
B
Hose (A) is connected to the carburetor. When you push
the air purge bulb, a vacuum is caused and fuel fills the
fuel chamber. When the fuel chamber is fully filled,
unwanted fuel is pushed to the tank through return hose
(B). This means that the fuel level in the carburetor does
not become too high.
6.5.10 To do a test of the air purge bulb
Use the pressure test tool. Refer to
overview on page 12 .
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Servicing tools
If the air purge bulb does not fill with fuel when you push
it, do this procedure.
1. Connect the pressure test tool to the hose from the
air purge bulb.
2. Set the pressure test tool for vacuum test.
3. Push the air purge bulb to increase the pressure to
0.3–0.5 bar.
If the pressure can be increased to 0.3–0.5 bar, the air
purge bulb and hose connection are not damaged. Then
it is necessary to look for faults in the other components
of the fuel system.
Repair and servicing - 35