FS 40, FS 40 C, FS 50, FS 50 C
English
20
The container should be kept tightly 
closed in order to limit the amount of 
moisture that gets into the mixture.
The machine‘s fuel tank should be 
cleaned as necessary.
Fuel mix ages
Only mix sufficient fuel for a few days 
work, not to exceed 30 days of storage. 
Store in approved fuel-containers only. 
When mixing, pour oil into the container 
first, and then add gasoline. Close the 
container and shake it vigorously by 
hand to ensure proper mixing of the oil 
with the fuel.
Dispose of empty mixing-oil containers 
only at authorized disposal locations.
Preparations
N Before fueling, clean the filler cap 
and the area around it to ensure that 
no dirt falls into the tank.
Always thoroughly shake the mixture in 
the canister before fueling your 
machine.
N Position the machine so that the 
filler cap is facing up.
WARNING
In order to reduce the risk of fire and 
personal injury from escaping gas vapor 
and fumes, remove the fuel filler cap 
carefully so as to allow any pressure 
build-up in the tank to release slowly.
One of two different filler caps is 
installed as standard at the factory.
Toolless filler cap (with folding grip)
Threaded filler cap
Opening the toolless filler cap
N Raise the grip into an upright 
position.
Gaso-
line
Oil (STIHL 50:1 or equiva-
lent high-quality oils)
US gal. US fl.oz.
12.6
2 1/2 6.4
512.8
Fueling