FORD 2015 F-550 v.2 - Manual (Page 143)

We recommend regular unleaded gasoline
with a pump (R+M)/2 octane rating of 87.
Some stations offer fuels posted as regular
with an octane rating below 87, particularly
in high altitude areas. We do not
recommend fuels with an octane rating
below 87.
Do not be concerned if your engine
sometimes knocks lightly. However, if it
knocks heavily under most driving
conditions while you are using fuel with the
recommended octane rating, see your
authorized dealer to prevent any engine
damage.
RUNNING OUT OF FUEL
Avoid running out of fuel because this
situation may have an adverse effect on
powertrain components.
If you run out of fuel:
•
You may need to switch the ignition
from off to on several times after
refueling to allow the fuel system to
pump the fuel from the tank to the
engine. When restarting, cranking time
takes a few seconds longer than
normal. With keyless ignition, just start
the engine. Crank time will be longer
than usual.
• Normally, adding 1 gallon (3.8 liters) of
fuel is enough to restart the engine. If
the vehicle is out of fuel and on a steep
grade, more than 1 gallon (3.8 liters)
may be required.
• The service engine soon indicator may
come on. For more information on the
service engine soon indicator, See
Warning Lamps and Indicators
(page 79).
Refilling With a Portable Fuel
Container
WARNINGS
The fuel system may be under
pressure. If you hear a hissing sound
near the fuel filler door, do not refuel
until the sound stops. Otherwise, fuel may
spray out, which could cause serious
personal injury.
Do not try to pry open or push open
the fuel system with foreign objects.
This could damage the fuel system
and its seal and cause personal injury to
you or others.
Use the following directions when filling
from a portable fuel container:
1.
Remove the fuel cap from the fuel filler
pipe by rotating it counter clockwise.
2. Slowly insert the portable fuel
container into the fuel filler opening.
3. Fill the vehicle with fuel from the
portable fuel container.
4. When done, remove the portable fuel
container nozzle and reinstall the fuel
cap. Insert fuel cap into fuel filler
opening and turn clockwise until you
hear a click.
REFUELING
WARNINGS
Fuel vapor burns violently and a fuel
fire can cause severe injuries.
Read and follow all the instructions
on the pump island.
Turn off your engine when you are
refueling.
Do not smoke if you are near fuel or
refueling your vehicle.
140
Super Duty (), enUSA
Fuel and Refueling