Manual Fuel Pump - Stihl MS 231 Manual

– Install the air guide shroud,
b 12.4.1
– Install the carburetor, b 12.5
2
1
: Push the fuel suction hose (1)
and fuel return hose (2) onto the
nipples (arrows) as far as stop.
– Check operation of manual fuel
pump, b 12.11.4
– Reassemble all other parts in the
reverse sequence.
MS 231, MS 231 C, MS 251, MS 251 C
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12.11.4 Manual Fuel Pump

– Remove the filter base, b 12.3
: Disconnect the fuel suction
hose (1) and fuel return hose (2)
from the nipples (arrows).
– Install new fuel hoses.
: Squeeze the tabs (arrows)
together and pull out the manual
fuel pump (1).
– Check the oil fuel pump and
replace if necessary.
Installing
2
: Position the fuel pump (1) so that
1
: Push the fuel pump (1) into the
1
: Push the fuel return hose (1) onto
: Push the fuel suction hose (4)
– Check operation
– Reassemble all other parts in the
2
3 1
the lug (3) points towards the
recess (arrow).
air guide shroud (2) until the tabs
engage.
3 1
2
6 4 5
the long nipple (2) and elbow
connector (3).
onto the short nipple (5) and the
carburetor connector (6).
– fuel must flow when the fuel
pump is operated.
reverse sequence.
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