FORD 2014 Flex v.1 - Manual (Page 189)

Do not be concerned if your engine sometimes knocks lightly. However, if
it knocks heavily 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, crank time will be 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 in the Instrument Cluster chapter.
Refilling with a Portable Fuel Container
WARNING: Do not insert the nozzle of a portable fuel container
or aftermarket funnel into the capless 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 capless fuel
system with foreign objects. This could damage the fuel system
and its seal and cause injury to you or others.
Note: Do not use aftermarket funnels; they will not work with the
capless fuel system and can damage it. The included funnel has been
specially designed to work safely with your vehicle.
When filling the vehicle’s fuel tank from a portable fuel container, use the
funnel included with the vehicle.
188 Fuel and Refueling
2014 Flex (471)
Owners Guide gf, 1st Printing, April 2013
USA (fus)