Octane Recommendations - Gasoline Engines
Regular unleaded gasoline with a
pump (R+M)/2 octane rating of 87 is
recommended. Some stations offer
fuels posted as Regular with an
octane rating below 87, particularly in
high altitude areas. Do not use fuels with a posted 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
Gasoline Engine
Avoid running out of fuel because this situation may have an adverse
effect on powertrain components.
If you have run out of fuel:
• You may need to cycle 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. On restarting, cranking time takes a few seconds longer
than normal.
• If your vehicle is equipped with dual fuel tanks, adding
four–five gallons (15–19 liters) of fuel is enough to restart the
engine. If the vehicle is out of fuel and on a steep grade, more than
four–five gallons (15–19 liters) may be required.
• The service engine soon indicator may come on. For more
information on the service engine soon indicator, see the Instrument
Cluster chapter.
See General information in the Information Displays chapter for
information on Miles to Empty.
Diesel Engine
Avoid running out of fuel as this allows air to enter the fuel system,
which makes restarting the vehicle difficult.
If you have run out of fuel:
• If your vehicle is equipped with dual fuel tanks, adding
four–five gallons (15–19 liters) of fuel is enough to restart the
engine. If the vehicle is out of fuel and on a steep grade, more than
four–five gallons (15–19 liters) may be required.
87
(R+M)/2 METHOD
116 Fuel and Refueling
2013 F-650/750 (f67)
Owners Guide gf, 2nd Printing, March 2013
USA (fus)
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