FORD 2014 F-550 v.2 - Manual (Page 141)

If the Check Fuel Cap light or a Check Fuel
Cap message appears in the instrument
cluster and stays on after you start the
engine, the fuel filler cap may not be
properly installed.
If the fuel cap light remains on, at the next
opportunity, safely pull off of the road,
remove the fuel filler cap, align the cap
properly and reinstall it. The check fuel cap
light or Check fuel cap message may not
reset immediately; it may take several
driving cycles for the indicators to turn off.
A driving cycle consists of an engine
start-up (after four or more hours with the
engine off) followed by normal city and
highway driving.
FUEL CONSUMPTION
Empty reserve is the amount of fuel
remaining in the tank after the fuel gauge
indicates empty. The amount of usable
fuel in the empty reserve varies and should
not be relied upon to increase driving range.
• The usable capacity of the fuel tank is
the amount of fuel that can be added
into the tank after the gauge indicates
empty
• The advertised capacity is the total fuel
tank size. See Capacities and
Specifications (page 292). It is the
combined usable capacity plus the
empty reserve.
• Due to the empty reserve, you may not
be able to refuel the full amount of the
advertised capacity of the fuel tank
even when the fuel gauge reads empty.
Filling the Tank
For consistent results when filling the fuel
tank:
• Turn the ignition off before fueling; an
inaccurate reading results if the engine
is left running.
• Use the same fill rate
(low-medium-high) each time the tank
is filled.
• Allow no more than two automatic
click-offs when filling.
Results are most accurate when the filling
method is consistent.
Calculating Fuel Economy
Do not measure fuel economy during the
first 1000 miles (1600 kilometers) of
driving (this is your engine’s break-in
period); a more accurate measurement is
obtained after 2000 miles - 3000 miles
(3200 kilometers - 4800 kilometers). Also,
fuel expense, frequency of fill ups or fuel
gauge readings are not accurate ways to
measure fuel economy.
1. Fill the fuel tank completely and record
the initial odometer reading.
2. Each time you fill the tank, record the
amount of fuel added.
3. After at least 3 to 5 tank fill ups, fill the
fuel tank and record the current
odometer reading.
4. Subtract your initial odometer reading
from the current odometer reading.
5. Calculate fuel economy by dividing
miles traveled by gallons used (For
Metric: Multiply liters used by 100, then
divide by kilometers traveled).
Keep a record for at least 1 month and
record the type of driving (city or highway).
This provides an accurate estimate of the
vehicle’s fuel economy under current
driving conditions. Additionally, keeping
records during summer and winter show
how temperature impacts fuel economy.
In general, lower temperatures mean lower
fuel economy.
138
Super Duty (TFA)
Fuel and Refueling