FORD 2013 F-550 v.1 - Manual (Page 191)

Octane Recommendations
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
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 will take a few seconds longer
than normal.
• Normally, adding 1 gallon (3.8L) of fuel is enough to restart the
engine. If the vehicle is out of fuel and on a steep grade, more than
1 gallon (3.8L) may be required.
• The service engine soon indicator may come on. For more information on
the service engine soon indicator, refer to the Instrument Cluster chapter.
See Settings in the Instrument Cluster chapter for information on
calculating DTE (Distance to empty).
Refilling With a Portable Fuel Container
WARNING: Do not insert the nozzle of portable fuel containers
or aftermarket funnels the fuel system. This could damage the
fuel system and its seal, and may cause fuel to run onto the ground
instead of filling the tank, which could result in serious personal injury.
WARNING: 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 injury to you or others.
87
(R+M)/2 METHOD
190 Fuel and Refueling
2013 F-250/350/450/550 (f23)
Owners Guide gf, 1st Printing
USA (fus)