FS 40, FS 40 C, FS 50, FS 50 C
English
6
WARNING
Fueling Instructions
WARNING
To reduce the risk of serious injury from 
burns, never attempt to refuel the unit 
until it has been completely removed 
from the operator.
WARNING
Fuel your power tool in well-ventilated 
areas, outdoors. Always shut off the 
engine and allow it to cool before 
refueling. Gasoline vapor pressure may 
build up inside the fuel tank depending 
on the fuel used, the weather conditions 
and the tank venting system.
In order to reduce the risk of burns and 
other personal injury from escaping gas 
vapor and fumes, remove the fuel filler 
cap on your power tool carefully so as to 
allow any pressure build-up in the tank 
to release slowly. Never remove the fuel 
filler cap while the engine is running.
Select bare ground for fueling and move 
at least 10 feet (3 m) from the fueling 
spot before starting the engine. Wipe off 
any spilled fuel before starting your 
machine.
WARNING
Different models may be equipped with 
different fuel caps.
WARNING
In order to reduce the risk of fuel spillage 
and fire from an improperly tightened 
fuel cap, correctly position and tighten 
the fuel cap in the fuel tank opening.
Toolless cap with grip
To do this with this STIHL cap, raise the 
grip on the top of the cap until it is upright 
at a 90° angle. Insert the cap in the fuel 
tank opening with the raised positioning 
marks on the grip of the cap and on the 
fuel tank opening lining up. Using the 
grip, press the cap down firmly while 
turning it clockwise as far as it will go 
(approx. 1/4 turn).
Misaligned, damaged or broken cap
N If the cap does not drop fully into the 
opening when the positioning marks 
line up and/or if the cap does not 
tighten properly when twisted, the 
base of the cap may be prematurely 
rotated (in relation to the top) to the 
closed position. Such misalignment 
can result from handling, cleaning 
or an improper attempt at 
tightening.
Gasoline is an extremely 
flammable fuel. If spilled 
and ignited by a spark or 
other ignition source, it 
can cause fire and seri-
ous burn injury or 
property damage. Use 
extreme caution when 
handling gasoline or fuel 
mix. Do not smoke or 
bring any fire or flame 
near the fuel or the power 
tool. Note that combusti-
ble fuel vapor may 
escape from the fuel 
system.
Check for fuel leakage 
while refueling and during 
operation. If fuel leakage 
is found, do not start or 
run the engine until the 
leak is fixed and any 
spilled fuel has been 
wiped away. Take care 
not to get fuel on your 
clothing. If this happens, 
change your clothing 
immediately.
Fold the grip flush with 
the top of the cap. Check 
the cap for tightness. If 
the grip does not lie com-
pletely flush with the cap 
and the detent on the grip 
does not fit in the corre-
sponding recess in the 
filler opening, or if the cap 
is loose in the filler open-
ing, the cap is not 
properly seated and tight-
ened and you must 
repeat the above steps.