Ford Super Duty (2018 year). Manual — part 47

Biodiesel fuels degrade more easily than
diesel fuels not containing biodiesel and
should not be stored in the fuel tank for
more than 1 month. If you plan to park or
store your vehicle for more than 1 month,
then you should empty your vehicle fuel
tank of biodiesel fuel. You should fill the
tank with a pure petroleum-based diesel
fuel and run your vehicle for a minimum of
30 minutes.

Note: Degraded or oxidized biodiesel can
damage fuel system seals and plastics and
corrode steel parts.

During cold weather, if you have problems
operating on biodiesel, you may need to
use a diesel fuel with lower biodiesel
content, try another brand, or discontinue
the use of biodiesel.

Diesel Fuel Additives

It should not be necessary to add any
aftermarket additives to your fuel if you
use a high quality diesel fuel that conforms
to ASTM industry specifications.
Aftermarket additives can damage the fuel
injector system or engine.

Use Motorcraft® cetane booster or an
equivalent cetane booster additive if you
suspect fuel has low cetane. Use
Motorcraft® anti-gel & performance
improver or an equivalent additive if there
is fuel gelling.

Do not use alcohol-based additives to
improve cetane quality, to prevent fuel
gelling or any other use. The use of alcohol
additives may result in damage to the fuel
injectors and system. See Capacities and
Specifications (page 433).

The Vehicle Warranty may not cover
repairs needed to correct the effects of
using an aftermarket product that does
not meet Ford specifications in your fuel.

FUEL QUALITY - GASOLINE

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 as well
as other conditions, for example when
towing a trailer. See Towing (page 273).

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.

RUNNING OUT OF FUEL

Avoid running out of fuel because this
situation may have an adverse effect on
engine 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. With
keyless ignition, just start the engine.
Crank time will be longer than usual.

•

Normally, adding 1 gal (4 L) of fuel is
enough to restart the engine. If the
vehicle is out of fuel and on a steep
grade, more than 1 gal (4 L) may be
required.

REFUELING - GASOLINE

WARNINGS

Fuel vapor burns violently and a fuel
fire can cause severe injuries.

Read and follow all the instructions
on the pump island.

Turn off your engine when you are
refueling.

Do not smoke if you are near fuel or
refueling your vehicle.

Keep sparks, flames and smoking
materials away from fuel.

Stay outside your vehicle and do not
leave the fuel pump unattended
when refueling your vehicle. This is

against the law in some places.

Keep children away from the fuel
pump; never let children pump fuel.

Do not use personal electronic
devices while refueling.

Wait at least 10 seconds before
removing the fuel pump nozzle to
allow any residual fuel to drain into

the fuel tank.

Stop refueling after the fuel pump
nozzle automatically shuts off for the
second time. Failure to follow this

will fill the expansion space in the fuel tank
and could lead to fuel overflowing.

Do not remove the fuel pump nozzle
from its fully inserted position when
refueling.

Use the following guidelines to avoid
electrostatic charge build-up when filling
an ungrounded fuel container:
•

Place approved fuel container on the
ground.

•

Do not fill a fuel container while it is in
the vehicle (including the cargo area).

•

Keep the fuel pump nozzle in contact
with the fuel container while filling.

•

Do not use a device that would hold
the fuel pump handle in the fill position.

Fuel Filler Cap

WARNINGS

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

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

If you do not use the proper fuel filler
cap, excessive pressure or vacuum
in the fuel tank may damage the fuel

system or cause the fuel cap to disengage
in a collision, which may result in possible
personal injury.

Note: If you must replace the fuel filler cap,
replace it with a fuel filler cap that is
designed for your vehicle. The customer
warranty may be void for any damage to the
fuel tank or fuel system if the correct
genuine Ford, Motorcraft or other certified
fuel filler cap is not used.

Your fuel tank filler cap has an indexed
design with a 1/4th turn on and off feature.
When fueling your vehicle:

1.

Put your vehicle in park (P).

2. Switch the engine off.

3. Carefully turn the filler cap

counterclockwise until it spins off.

4. Pull to remove the cap from the fuel

filler pipe.

5. To install the cap, align the tabs on the

cap with the notches on the filler pipe.

6. Turn the filler cap clockwise 1/4 of a

turn clockwise until it clicks at least
once.

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, you may not have installed the fuel
filler properly.

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.

REFUELING - DIESEL

WARNINGS

Read and follow all the instructions
on the pump island.

Stay outside your vehicle and do not
leave the fuel pump unattended
when refueling your vehicle.

Keep children away from the fuel
pump. Never let children pump fuel.

Wait at least 10 seconds before
removing the fuel pump nozzle to
allow any residual fuel to drain into

the fuel tank.

Do not remove the fuel pump nozzle
from its fully inserted position when
refueling.

WARNINGS

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.

Stop refueling after the fuel pump
nozzle automatically shuts off for the
second time. Failure to follow this

will fill the expansion space in the fuel tank
and could lead to fuel overflowing.

The fuel system may be under
pressure. If the fuel filler cap is
venting vapor or if you hear a hissing

sound, wait until it stops before completely
removing the fuel filler cap. Otherwise, fuel
may spray out and injure you or others.

If you do not use the proper fuel filler
cap, excessive pressure or vacuum
in the fuel tank may damage the fuel

system or cause the fuel cap to disengage
in a collision, which may result in possible
personal injury.

Note: If you must replace the fuel filler cap,
replace it with a fuel filler cap designed for
your vehicle. The vehicle Warranty may be
void for any damage to the fuel tank or fuel
system if the correct genuine Ford or
Motorcraft® fuel filler cap is not used.

Fueling Tips

If air is allowed to enter the fuel system the
engine automatically purges any trapped
air. To purge the air sooner: prior to engine
start, prime the system by turning the key
to on for 30 seconds then to off. Repeat
this several times. The engine may run
rough and produce white smoke while air
is in the system. This is normal.

Use only clean, approved containers that
will prevent the entry of dirt or water
whenever you store diesel fuel.

Diesel fuel must not be stored in a
galvanized container. The fuel will dissolve
the zinc in the galvanized container. The
zinc will then remain in the fuel. If you run
the contaminated fuel through the engine,
the zinc will deposit in the fuel injectors
causing expensive-to-repair damage.

Diesel fuel dispensing nozzle fill rate

Your vehicle has a fuel fill pipe that is able
to accept fuel up to 20 gal (76 L) per
minute from an 1.2 in (30 mm)
fuel-dispensing nozzle. Pumping fuel at
greater flow rates may result in premature
nozzle shut-off or spit back.

Truck stops have pumps and nozzles
designed for larger, heavy-duty trucks.
When refueling at truck stops: if the nozzle
shuts off repeatedly when refueling, wait
5–10 seconds; then use a slower rate of
flow, do not depress the nozzle trigger as
far.

Refueling

When fueling your vehicle do the following:

1.

Fully open the fuel tank filler door until
it engages and remove the fuel tank
filler cap. The fuel tank filler cap has
an indexed design with a 1/4 turn
on/off feature. Carefully turn the filler
cap counterclockwise until it spins off.