Tank Vent; Testing - Stihl MS 261 User Manual

: Inspect and clean the sealing
faces (arrows), b 15
The sealing faces must be in perfect
condition. Always replace
components with damaged sealing
faces.
Installing
2
1
1
: Position the manifold (2) on the
cylinder.
: Insert and tighten down the
screws (1) firmly.
– Install the air guide shrouds,
b 12.4
Models with heating, b 12.4.2
Models with manual fuel pump,
b 12.4.1
– Install the carburetor carrier,
b 12.8
– Reassemble all other parts in the
reverse sequence.
122
12.10

Tank Vent

12.10.1 Testing

If problems occur on the carburetor
or the fuel supply system, also
check and clean the tank vent and
replace it if necessary. Check
function by performing pressure and
vacuum tests on the tank via the fuel
hose.
– Open the fuel tank cap and drain
the fuel tank, b b 1.
– Close the tank cap.
– Remove the carburetor, b 12.5
1
1
: Push the
nipple (1) 0000 855 9200 into the
fuel hose (arrow).
Models with manual fuel pump
2
: Use a suitable plug (2) to seal the
fuel suction hose (1).
Vacuum test
: Push the ring (1) to the left and
connect the pump (2)
0000 850 1300 to the
nipple (arrow)
– create a vacuum in the fuel
tank.
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.
– Always install a new fuel hose.
– If necessary, install a new tank
vent or tank, b
b 12.11.5.
1
2
1
b 12.10 or
MS 261, MS 261 C