Carburetor - Husqvarna K770 Workshop Manual

Hose 1 is connected to the carburetor. The pump
causes a vacuum in the fuel chamber and fuel is pulled
into it. When the fuel chamber has been fully filled,
unwanted fuel is pushed to the tank through return hose
2. This means that the fuel level in the carburetor does
not get too high.
6.5.9 To examine the air purge
To examine the air purge, use Husqvarna test
instrument for fuel lines and check valves. See
tools overview on page 11
Press the bladder of the pump. It must be filled with fuel.
If it is not filled with fuel, the pump must be examined.
1. Connect the test instrument to the hose from the air
purge.
2. Set the test instrument for vacuum test.
3. Pump up a vacuum to 0.3–0.5 bar using the air
purge – not the tester.
If this can be done, the pump and hose connection are
not damaged. You must then look for the fault in the
other components of the fuel system.
651 - 001 - 27.06.2018
6.5.10 To remove the air purge
1. Remove the return hose and carburetor hose from
the pump.
Servicing
2. Press the click locks together with pliers and push
the pump out.

6.6 Carburetor

6.6.1 To remove the carburetor from the inlet
system
1. Remove the service filter.
2. Clean the outer parts of the carburetor before you
remove it from the inlet system.
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