10.5 Tank Vent
Correct operation of the carburetor is
only possible if atmospheric pressure
and internal fuel tank pressure are
equal at all times. This is ensured by
the tank vent.
Important: In the event of trouble
with the carburetor or the fuel supply
system, always check and clean the
tank vent.
• Unscrew the tank filler cap.
• Pull the valve out of its seat in
the tank.
Install in the reverse sequence.
• Remove the handle housing –
see 8.8.
• Take out fan housing mounting
screws.
• Remove the fan housing.
Note: Press in valve as far as stop.
Use a screwdriver to carefully
raise the rear of the handle
housing slightly. Position filter
element in the bore and press it
home as far as stop.
Equalization of pressure from the
outside inwards takes place via the
filter element (1) and the valve (2). If
pressure builds up in the tank, the
valve closes and excess pressure is
dissipated via the carburetor.
• Use suitable tool to remove filter
element.
Note: Remove handle housing if
necessary - see 8.8.
• Remove upper screws from tank
housing.
• Remove the exhaust muffler –
see 4.1.
• Remove cover from manifold.
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