Husqvarna K 960 Workshop Manual page 22

FUEL SYSTEM
Exclude the carburettor as
the cause of the leakage
Plug the hose by the carburettor
and redo the pressure test.
The fuel system's hoses
Split the machine at the vibra-
tion dampening element.
Note the fuel system hoses'
assembly order.
Changing the fuel hose
Dismantle and assemble the fuel
hose in the same direction –
from above towards the tank
cap.
Tank venting
The tank vent has a non-return valve that permits air to enter the tank, but
prevents fuel from running out.
Fault indication
Blocked tank vent is shown as follows: As the fuel tank is emptied during use
an underpressure is created in the tank, which reduces the fuel supply – the
machine lacks power. When the filler cap is opened air suction is audible.
Dismantling
Lift the non return valve out of the holder and remove the connections.
Non-return valve –
functional test
Connect the non return valve to
pressure tester 501 56 27-01.
Blow in the direction towards
the tank. The air should pass
without a build up of pressure.
Blow in the direction towards
the filter. Non return valve
should stop a pressure of
approximately 3–6 psi/20–40 kPa
and open at a higher pressure.
Exclude the carburettor as the
cause of the leakage
Plug the hose by the carburettor and
redo the pressure test. If the hose is
intact, the carburettor must be checked.
The fuel system's hoses
The machine must be split at the vibra-
tion dampening element, see page 8, to
work on the fuel system's hoses.
Note how the fuel hose and the tank
venting hoses are assembled.
Changing the fuel hose
Press the hose down in the tank and at
the same time feed down through the
hole from above, little by little.
The new hose is feed down in the tank
from above by hand. Greasing the hoses
facilitates assembly.
Non-return valve – functional test
Connect the non return valve to pressure
tester 501 56 27-01.
Note: Never expose the non return
valve to a high pressure (compressed air)!
Test the non return valve by first
blowing in the direction towards the
tank. The air should pass without a build
up of pressure.
Blow in the direction towards the filter.
The non return valve should stop a pre s -
sure of approximately 3–6 psi/20–40 kPa.
At a higher pressure the non return valve
opens.
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