2018 FORD F-650/750 Owners Manual

air filter when the restriction gauge reads
near the change filter line and the gauge
is yellow. If you allow the restriction gauge
to reach maximum restriction you can
affect your engine performance and fuel
economy.
Note:
Do not blow out the air filter element
with compressed air since the compressed
air could damage the filter paper.
Note: Do not rely on filter appearance
alone. A filter which appears to be dirty may
actually have several thousand miles
(kilometers) of life remaining. After installation of the new filter element,
reset the gauge by pressing the reset
button on top of the gauge.
The following actions are recommend after
operating the vehicle up to 200 miles (320
km) in heavy snowfall or extreme rain:
•
Snow: At the earliest opportunity, open
the hood and clear all the snow and ice
from the air filter housing inlet (do NOT
remove the foam filter) and reset the
air filter restriction gauge.
• Extreme rain: The air filter will dry after
about 15– 30 minutes at highway
speeds. At the earliest opportunity,
open the hood and reset the air filter
restriction gauge.
Air Filter Replacement
When replacing the air filter element, use
a Motorcraft® air filter element. See
Motorcraft Parts (page 257).
Note: Failure to use the correct air filter
element may result in severe engine
damage.
214
F650750 (TBC) , enUSA, Edition date: 201708, First Printing MaintenanceE163373

1. Locate the mass airflow sensor
electrical connector on the air inlet
tube. This connector will need to be
unplugged. Unlock the locking clip on
the connector, then squeeze and pull
the connector off the air inlet tube.
215
F650750 (TBC) , enUSA, Edition date: 201708, First Printing MaintenanceE163374

2. Remove the clips that secure the air
filter housing cover. Push the air filter
cover forward (away from you) and up
slightly to release it.
3. Remove the air filter element from the
air filter housing. 4. Remove and install a new foam filter
if needed according to the service
interval indicated in the scheduled
maintenance information in this guide.
If you do not replace the foam filter, be
sure the existing foam filter is in place. 5. Install a new air filter element. Be sure
that the groove seal on the pleated
paper filter traps both sides of the
vertical partition of the air box.
6. Engage the clips to secure the air filter housing cover to the air filter housing.
Be careful not to crimp the filter
element edges between the air filter
housing and cover. Ensure that you
align the tabs on the edge properly into
the slots.
7. Reconnect the mass airflow sensor electrical connector to the inlet tube.
Make sure the locking tab on the
connector is in the locked position.
Air Purge Procedure
Turn the key on for 30 seconds, and then
turn off. Repeat the procedure six times.
216
F650750 (TBC) , enUSA, Edition date: 201708, First Printing MaintenanceE206906
x3 E163376 E163377

CHANGING THE ENGINE AIR
FILTER - 6.8L
WARNING
To reduce the risk of vehicle damage
and personal burn injuries, do not
start your engine with the air cleaner
removed and do not remove it while the
engine is running. Note:
Operating your vehicle in heavy
snowfall or extreme rain conditions may
allow excessive amounts of snow or water
into the air intake system. This could plug
or soak the air filter that could cause the
engine to lose power or shut down.
When replacing the air filter element, use
a Motorcraft® air filter element. See
Motorcraft Parts (page 258).
Note: Failure to use the correct air filter
element may result in severe engine
damage. Resulting component damage
may not be covered by the vehicle Warranty.
Change the air filter element at the correct
interval. See
Scheduled Maintenance
(page 320). 1. Locate the mass air flow sensor
electrical connector on the air outlet
tube. Disconnect the mass air flow
sensor electrical connector. 2. Reposition the locking clip on the
connector (connector shown from
below for clarity), squeeze the
connector and pull it off of the air
outlet tube. 3.
Clean the area from around the air tube
to the air cover connection to prevent
debris from entering the system. Next,
loosen the bolt on the air tube clamp
so the clamp is no longer snug to the
air tube. It is not necessary to
completely remove the clamp.
4. Pull the air tube off from the air cleaner
housing.
217
F650750 (TBC) , enUSA, Edition date: 201708, First Printing MaintenanceE163755 E163756 E163757

5. Remove the clips that secure the air
filter housing cover. Push the air filter
cover toward the center of the vehicle
and up slightly to release it.
6. Remove the air filter element from the
air filter housing.
7. Install the new air filter element.
8. Engage the clips to secure the air filter housing cover to the air filter housing.
Be careful not to crimp the filter
element edges between the air filter
housing and cover. Ensure that you
align the tabs on the edge properly into
the slots.
9. Slip the air tube onto the air filter housing and tighten the air-tube clamp
bolt snugly. Do not over tighten
air-tube clamp bolt. 10. Reconnect the mass air flow sensor
electrical connector to the outlet
tube. Make sure the locking tab on
the connector is in the locked position
(connector shown from below for
clarity).
CHANGING THE ENGINE-
MOUNTED AND DIESEL FUEL
CONDITIONER MODULE FUEL
FILTERS WARNING
Do not dispose of fuel in the
household refuse or the public
sewage system. Use an authorized
waste disposal facility. Your vehicle has two fuel filters. The first
filter mounts on top of the engine on the
left-hand side. The second filter is inside
the diesel fuel conditioner module. The
module is mounted between the outboard
side of the fuel tank and the frame rail.
Note:
The module is at the front of the fuel
tank or at the front of the aft-axle fuel tank
on some models.
218
F650750 (TBC) , enUSA, Edition date: 201708, First Printing MaintenanceE207259
x3 E163760

Regular fuel filter changes are an
important part of engine maintenance;
failing to keep with the scheduled
maintenance could lead to engine
performance issues and fuel injection
system damage. See Scheduled
Maintenance (page 320).
Use only recommended service parts
conforming to specifications. See
Motorcraft Parts
(page 257).
Note: Using fuel that has high levels of
impurities may require more frequent filter
replacements than the service interval
specifies.
Diesel Fuel Conditioner Module
Filter
Removal
1. Access the underside of your vehicle. 2. The diesel fuel conditioner module is
on the left-hand frame rail. 3. Drain the diesel fuel conditioner
module. Turn the drain plug
counterclockwise until it stops. Do not
use any tools to loosen the drain plug.
Drain the filter, approximately
0.5 gal
(2 L), into an appropriate container.
Do not re-use the fuel drained from the
module. 219
F650750 (TBC) , enUSA, Edition date: 201708, First Printing MaintenanceE250852 E250850 E250851

4. Disconnect the electrical connector.
5. Fully loosen the lower portion of the
diesel fuel conditioner module housing
using the nut cast into the lower
portion. 6.
Remove the lower portion of the diesel
fuel conditioner module housing and
the diesel fuel conditioner module
filter.
Installation
1. Install the lower portion of the housing.
Tighten by hand until you feel a strong
resistance.
2. Connect the electrical connector.
3. Tighten the drain plug, turn it clockwise
until it stops and you feel a strong
resistance. Do not use any tools to
tighten the drain plug.
4. Switch the ignition on for 30 seconds and then switch the ignition off.
Repeat this operation six times in a row
to purge any trapped air from the fuel
system. Engine-mounted Fuel Filter
Although the fuel system is not fully
pressurized when the vehicle is off, some
residual pressure may remain in the fuel
system since it can take some time for the
pressure to completely bleed off.
Therefore, we recommend you place an
absorbent cloth below the filter connectors
to absorb any fuel that may drain.
The engine-mounted fuel filter is a plastic
disposable cartridge.
Removal
1.
Disconnect the fuel lines by squeezing
the connector tabs and pulling the lines
straight off.
220
F650750 (TBC) , enUSA, Edition date: 201708, First Printing MaintenanceE250849 E226215
1

2.
Rotate the filter fully counterclockwise
until the peg is at the far end of the slot.
3. Pull the filter straight up from the bracket and discard the filter.
Installation
1. Install the new filter into the filter bracket. Turn the filter clockwise to
lock it in place.
2. Reconnect the fuel lines.
3. Switch the ignition on for 30 seconds and then switch the ignition off.
Repeat this operation six times in a row
to purge any trapped air from the fuel
system.
ELECTRICAL SYSTEM
INSPECTION
Periodically inspect electrical connectors
on the outside of the cab and on the engine
and frame for corrosion and tightness.
Exposed terminals, such as the fuel sender,
cranking motor, alternator and
feed-through studs, should be cleaned and re-coated with a lubricant sealing grease
such as Motorcraft Silicone Brake Caliper
Grease and Dielectric Compound XG-3, or
equivalent. This should include the ground
cable connector for batteries, engine and
cab as well as the jump-starting stud.
Accessory Feed Connections
Vehicle electrical systems are complex and
often include powertrain components,
such as engine and transmission controls,
instrument panels and ABS. While most
systems operate on battery voltage (12
volts), some systems can be as high as 90
volts or as low as five volts. See the
Electrical Circuit Diagram Manuals,
available from your vehicle
’s manufacturer,
to make sure that any extra body lights and
accessory connections to circuits are both
appropriate and not overloaded. Do not
make modifications to any vehicle control
system without first contacting an
authorized dealer.
AIR INDUCTION SYSTEM
INSPECTION WARNING
When performing maintenance to
any turbocharged engine with engine
air inlet piping disconnected, keep
loose clothing, jewelry and long hair away
from the engine air inlet piping. A
turbocharger compressor air inlet
protective shield should be installed over
the turbocharger air inlet to reduce the risk
of personal injury or death. Perform a complete inspection of the air
induction system annually.
221
F650750 (TBC) , enUSA, Edition date: 201708, First Printing MaintenanceE226214
2
3