Stihl TS 400 - Tank Vent

STIHL TS 400 44
10.4 Tank vent
A pressure balance must always be
maintained between the inside of the
fuel tank and the atmosphere outside
in order to ensure troublefree
operation of the carburetor. This
pressure balance is maintained by the
tank vent.
Important! The tank vent must also
be inspected and cleaned if
malfunctions occur in the carburetor
or fuel supply.
The fuel tank is vented via a
compensator reservoir.
The pressure in the compensator
reservoir is compensated from the
outside inwards via a filter (1) and
valve.
Note: The filter prevents dirt from
entering the valve and compensator
reservoir. The cap (2) protects the
filter against damage and
contamination.
- Remove shroud, see 5.5.
• Prise out and remove tank vent.
It is returned to the fuel tank when a
negative pressure is established.
The pressure in the compensator
reservoir is compensated from the
inside outwards via the holes in the
tank vent and the filter.
• Check and replace spout.
The parts are reassembled and
installed in reverse order.
If an excess pressure builds up in
the fuel tank, fuel enters the
compensator reservoir via a
connector and hose.
• Prise off cap (1).
• Remove filter (2) and valve (3)
from tank vent (4).
• Remove connecting hose (5).
• Unscrew vent insert (6).