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FUEL SYSTEM
Exclude the carburettor as
the cause of the leakage
Dismantle the carburettor unit.
Plug the hose by the carburettor
and redo the pressure test.
Changing the fuel hose
Loosen the cable lug to the stop
switch.
Remove the hose from the tank
at the same time as it is fed
down through the hole in the
carburettor compartment.
Fit the hose in the same direc-
tion by hand or with the help
of a pair of pliers. Greasing the
hoses facilitates assembly.
Note the how the fuel hose is
fitted.
Refit the cable lug!
Tank venting
The tank vent has a non-return
valve and a sintered metal filter.
Fault indication
Blocked tank vent is shown
as follows: As the fuel tank is
emptied during use an under-
pressure is created in the tank,
which reduces the fuel supply –
the machine lacks power. Air
suction is audible when the fil-
ler cap is opened.
Dismantling
Dismantle the carburettor unit
and choke control.
Exclude the carburettor as the
cause of the leakage
Dismantle the carburettor unit. Plug
the hose by the carburettor and redo the
pressure test. If the hose is intact, the
carburettor must be checked.
Changing the fuel hose
Loosen the cable lug to the stop switch
to gain better access to the fuel hose.
Remove the hose from the tank at the
same time as it is fed down through the
hole in the carburettor compartment
little by little.
The new hoses is fed down into the tank
from the carburettor compartment. Feed
down the hose by hand or with the help
of a pair of pliers. Greasing the hoses
facilitates assembly.
Note how the fuel hose is fitted on the
tank unit when assembling.
Do not forget to refit the cable lug on
the stop switch!
Tank venting
The tank vent has a non-return valve
that permits air to enter the tank, but
prevents fuel from running out. The
sintered metal filter permits air to pass
slowly.
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 filler cap is
opened air suction is audible.
Dismantling
The carburettor unit must be dismantled
to gain access to the tank vent.
Remove the choke control.
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