Ford Fusion Hybrid / Fusion Energi (2018 year). Manual — part 37

Answer

Question

The engine is required to turn on above this

speed to protect the transmission hard-

ware.

Why does my engine never shut down

above 85 mph (137 km/h)

In order to make sure that the climate

control system can begin heating the cabin

or defrosting the windshield as soon as a

driver requests it, the engine coolant

temperature has to be kept sufficiently hot.

Keeping the engine on is required to main-

tain the correct coolant temperature.

Why does my engine stay on when it is

extremely cold outside?

Your vehicle's engine and transmission are

designed to deliver the power you need at
the most efficient engine speed. This may

be higher than expected during heavy

accelerations, and may fluctuate when

driving at a steady speed. These are charac-

teristics of the Atkinson engine cycle and

the transmission technology that help

maximize your hybrid's fuel economy.

Why does my engine rev up so high some-

times when I accelerate?

The fan noise comes from a fan located

next to the high voltage battery pack. This

fan turns on when the battery requires

cooling air. The fan speed, and associated

noise level, will change according to the

amount of cooling required to maintain

good performance. Maintaining the battery

temperature at optimal conditions also

prolongs the useful life of the battery and

helps to achieve better fuel economy.

What is the fan noise I hear from the rear

of my hybrid?

Change the engine oil every 10,000 mi

(16,000 km) or once per year under normal

operating conditions.

What is the engine oil change service

interval?

Your hybrid vehicle can use E15 (15%

ethanol, 85% gasoline) fuel, but you may

notice slightly reduced fuel economy

because ethanol contains less energy per

gallon than gasoline. Your hybrid vehicle is

not designed to use E85 (85% ethanol).

Can I put E15 or E85 in my vehicle, and how

will it affect my fuel economy?

Answer

Question

The high voltage battery system is designed

to last the life of the vehicle and requires

no maintenance.

How long will my high voltage battery last?

Does it need maintenance?

There are no provisions for charging the

high voltage battery from a power supply

external to the vehicle. (For C-MAX Energi
vehicles, the vehicle can be plugged into a

110-volt outlet with charge cord provided.)

Can you charge the battery with a plug into

an A/C outlet?

Yes. Your hybrid vehicle can be flat towed

without modification. See Towing (page

223).

Can I tow the hybrid behind my motor home

with all four wheels down?

SAFETY PRECAUTIONS

WARNINGS

Do not overfill the fuel tank. The
pressure in an overfilled tank may
cause leakage and lead to fuel spray

and fire.

The fuel system may be under
pressure. If you hear a hissing sound
near the fuel filler inlet, do not refuel

until the sound stops. Otherwise, fuel may
spray out, which could cause serious
personal injury.

Fuels can cause serious injury or
death if misused or mishandled.

Fuel may contain benzene, which is
a cancer-causing agent.

When refueling always shut the
engine off and never allow sparks or
open flames near the fuel tank filler

valve. Never smoke or use a cell phone
while refueling. Fuel vapor is extremely
hazardous under certain conditions. Avoid
inhaling excess fumes.

Follow these guidelines when refueling:
•

Extinguish all smoking materials and
any open flames before refueling your
vehicle.

•

Always switch the engine off before
refueling.

•

Automotive fuels can be harmful or
fatal if swallowed. Fuel is highly toxic
and if swallowed can cause death or
permanent injury. If fuel is swallowed
immediately call a physician, even if no
symptoms are immediately apparent.
The toxic effects of fuel may not be
apparent for hours.

•

Avoid inhaling fuel vapors. Inhaling fuel
vapor can lead to eye and respiratory
tract irritation. In severe cases,
excessive or prolonged breathing of
fuel vapor can cause serious illness and
permanent injury.

•

Avoid getting fuel in your eyes. If you
splash fuel in your eyes, immediately
remove contact lenses (if worn), flush
with water for 15 minutes and seek
medical attention. Failure to seek
proper medical attention could lead to
permanent injury.

•

Fuels can be harmful if absorbed
through the skin. If you splash fuel on
your skin, clothing or both, promptly
remove contaminated clothing and
thoroughly wash your skin with soap
and water. Repeated or prolonged skin
contact causes skin irritation.

•

Be particularly careful if you are taking
Antabuse or other forms of Disulfiram
for the treatment of alcoholism.
Breathing fuel vapors could cause an
adverse reaction, serious personal
injury or sickness. Immediately call a
physician if you experience any adverse
reactions.

FUEL QUALITY

Choosing the Right Fuel

E161513

Your vehicle is designed to operate on
regular unleaded gasoline with a minimum
pump (R+M)/2 octane rating of 87.

Some fuel stations, particularly those in
high altitude areas, offer fuels posted as
regular unleaded gasoline with an octane
rating below 87. We do not recommend
these fuels.

For best overall vehicle and engine
performance, premium fuel with an octane
rating of 91 or higher is recommended. The
performance gained by using premium fuel
is most noticeable in hot weather.

Do not use any fuel other than those
recommended because they could lead to
engine damage that will not be covered by
the vehicle Warranty.

Note: Use of any fuel other than those
recommended can impair the emission
control system and cause a loss of vehicle
performance.

Do not use:
•

Diesel fuel.

•

Fuels containing kerosene or paraffin.

•

Fuel containing more than 15% ethanol
or E85 fuel.

•

Fuels containing methanol.

•

Fuels containing metallic-based
additives, including manganese-based
compounds.

•

Fuels containing the octane booster
additive, methylcyclopentadienyl
manganese tricarbonyl (MMT).

•

Leaded fuel (using leaded fuel is
prohibited by law).

The use of fuels with metallic compounds
such as methylcyclopentadienyl
manganese tricarbonyl (commonly known
as MMT), which is a manganese-based
fuel additive, will impair engine
performance and affect the emission
control system.

Do not be concerned if the engine
sometimes knocks lightly. However, if the
engine knocks heavily while using fuel with
the recommended octane rating, contact
an authorized dealer to prevent any engine
damage.

Fuel Freshness Mode

(If Equipped)

This helps keep the fuel system functional
and the fuel fresh.

If you mainly use your vehicle in electric
power mode without refueling, the gasoline
in the fuel tank may become stale due to
aging. Stale gasoline can damage the
engine and fuel system.

Your vehicle automatically switches to fuel
freshness mode if you do not refuel your
vehicle with fresh fuel within an 18-month
period. Fuel freshness mode protects your
vehicle from potential engine and fuel
system damage caused by using stale fuel.

Note: If you do not add new fuel during an
18-month period, fuel freshness mode will
use fuel until approximately 1.2 gal (4.5 L)
of fuel remains in the fuel tank.

During fuel freshness mode:
•

The information display will indicate
fuel freshness mode is active.

•

The vehicle will only run in hybrid mode.
EV Now mode will not be available.

•

Most of the plug-in power will be
stored until fuel freshness mode is
completed.

Note: EV Now mode resumes when less
than 1.2 gal (4.5 L) of fuel remains in the fuel
tank.

Note: When the fuel level is less than
one-quarter full, refueling your vehicle will
end fuel freshness mode.

Note: We recommend you use a fuel
stabilizer if you use less than a full tank of
fuel during an 18-month period.