Tank Vent (Ms 201) - Stihl MS 201 Manual

Vacuum test
1
: Push the ring (1) to the left and
connect the pump (2)
0000 850 1300 to the nipple
(arrow)
– subject the fuel tank to a
vacuum.
Equalization of pressure takes
place via the tank vent. There must
be no buildup of vacuum in the tank.
– Clean the area around the tank
vent.
– Install new tank vent if necessary
MS 201 b 12.9.2,
MS 201 T b 12.9.3
Pressure test
1
: Push the ring (1) to the right and
connect the pump (2)
0000 850 1300 to the nipple
(arrow)
– pressurize the fuel tank.
MS 201, MS 201 C, MS 201 T, MS 201 TC
– Operate the pump until the
pressure gauge indicates a
pressure of 0.5 bar. If this
2
pressure remains constant for at
least 20 seconds, the tank,
including the tank vent, is airtight.
If the pressure drops, the leak
must be located and the faulty
part replaced.
1
– Pull the nipple out of the fuel
suction hose.
: Push the fuel suction hose (1)
onto the nipple so that the tab
matches the contour (arrow) of
the handle housing.
Models with manual fuel pump
2
: Pull plug out of fuel suction
hose (1).
– Install the carburetor,
MS 201 b 12.4,
MS 201 T b 12.5
All models
– Reassemble all other parts in the
reverse sequence.

12.9.2 Tank Vent (MS 201)

– Remove the filter base, b 12.3
1
: Use a screwdriver to pry out the
tank vent (1) at the recess
(arrow).
– Pull the tank vent (1) out of the
hose.
Always install a new tank vent.
1
2
– Position the new tank vent (1) so
that it points toward the seat.
: Push the tank vent (1) into the
vent hose (2) and into its seat
(arrow) as far as stop.
– Reassemble all other parts in the
reverse sequence.
1
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