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The machine's fuel tank should be
cleaned as necessary.
Fuel mix ages
If not using MotoMix, only mix sufficient
fuel for a few days of 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 by hand to ensure proper mix of oil and
gasoline.
WARNING
Shaking fuel can cause pressure to build
in the fuel container. To reduce the risk
of fire and severe personal injury or
property damage from fuel spraying,
allow the fuel container to sit for several
minutes before opening. Open the
container slowly to release any residual
pressures. Never open the fuel
container in the vicinity of any ignition
source. Read and follow all warnings
and instructions that accompany your
fuel container.
Gaso-
Oil (STIHL 50:1 or equiva-
line
lent high-quality oils)
US gal.
US fl.oz.
1
2.6
2 1/2
6.4
5
12.8
Dispose of empty mixing-oil containers
only at authorized disposal locations.
MS 250
Fueling
WARNING
Removing the cap on a pressurized fuel
tank can result in gasoline, vapors and
fumes being forcefully sprayed out from
the tank in all directions. The escaping
gasoline, vapors or fumes, sometimes
referred to as fuel spraying or
"geysering," can cause serious personal
injury, including fire and burn injury, or
property damage.
Fuel spraying can occur when the
engine is hot and the tank is opened
while under pressure. It can occur in hot
environments even if the engine has not
been running. Spraying is more likely to
occur when the fuel tank is half full or
more.
Avoid Injuries from Fuel Spraying.
Always follow the fueling instructions in
this manual:
Treat every fuel tank as if it is
–
pressurized, particularly if it is half
full or more.
Always allow the chain saw to cool
–
adequately before attempting to
open the fuel tank or refueling; this
will take longer in hot conditions.
Never remove the cap by turning it
–
directly to the open position. Turn it
first approximately 1/8 of a turn
counter-clockwise to the vent
position to relieve any residual
pressure.
Never open the fuel tank while the
–
engine is still hot or running.
Never open the fuel tank or re-fuel
–
the saw near any sparks, flames or
other ignition sources.
Pick the right fuel: use only good
–
quality (89 octane or higher), fresh
fuel blended for the season.
Vapor lock: do not remove the fuel
–
cap in an effort to relieve vapor lock.
Removing the cap has no effect on
vapor lock.
Be aware that fuel spraying is more
–
likely at higher altitudes.
Preparations
Before fueling, clean the filler cap
N
and the area around it to ensure that
no dirt falls into the tank.
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