HL 91 K
English
11
The fuel tank and the canister in which 
fuel mix is stored should be cleaned 
from time to time.
Fuel mix ratio
Only mix sufficient fuel for a few days 
work, not to exceed 30 days of storage. 
Store in approved safety fuel-canisters 
only. When mixing, pour oil into the 
canister first, and then add gasoline.
Dispose of empty mixing-oil canisters 
only at authorized disposal locations.
Fuel filler cap
WARNING
When fueling on a slope, always position 
the machine with the filler cap facing 
uphill.
N Place the machine on level ground 
so that the filler cap is facing up.
N Before fueling, clean the filler cap 
and the area around it to ensure that 
no dirt falls into the tank.
Open the tank cap.
N Turn the cap counterclockwise until 
it can be removed from the tank 
opening.
N Remove the cap.
Filling up with fuel
Take care not to spill fuel while fueling 
and do not overfill the tank.
STIHL recommends you use the STIHL 
filler nozzle for fuel (special accessory).
N Fill up with fuel.
Close the tank cap.
N Place the cap in the opening.
N Turn the cap clockwise as far as 
stop and tighten it down as firmly as 
possible by hand.
Examples
Gasoline Oil (STIHL 50:1 or equiva-
lent high-quality oils)
liters liters (ml)
10.02(20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
Fueling