Ford F-650 2008 User Manual page 178

Maintenance and Specifications
Running out of fuel
Avoid running out of fuel as this will allow air to enter the fuel system,
which will make restarting the vehicle difficult.
If you have run out of fuel:
• If your vehicle is equipped with dual fuel tanks, add at least 4–5
gallons (15–19 liters) of fuel to each tank before attempting to restart
the engine.
• The fuel system must be primed before attempting to restart the
engine. Refer to the engine operator's manual for instructions on
priming the engine.
• Use caution not to overheat and damage the starter by cranking
the engine for an excessive period of time. You may need to crank the
engine for a longer time than normal. If the engine fails to start in 30
seconds, turn the ignition to the OFF position and wait for two
minutes before cranking the engine again.
• Any remaining trapped air will self-purge from the fuel system once
the engine starts running.
• The engine may run rough and produce white smoke while air is in
the fuel system. This is normal and should stop after a short period of
time.
FUEL CONSUMPTION IMPROVEMENT MEASURES
There are two important factors you can control to improve fuel
economy: the mechanical condition of your vehicle and how you drive it.
A properly maintained vehicle will deliver better performance than a
neglected vehicle. Always follow your maintenance schedule to keep your
vehicle in top operating condition.
Also, your driving habits have a significant influence on use of fuel. By
following these suggestions, you can stretch your fuel use:
• Avoid changes in speed as much as possible.
• Anticipate changing traffic conditions. Sudden stops and fast
acceleration waste fuel.
• Avoid extensive idling.
• Do not drive with your foot resting on the brake pedal.
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2008 F-650/750 (f67)
Supplement