Ford F-450 (2017 year). Manual — part 88

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 restrict air
flow and cause the engine to lose power
or shut down.

After installing a new air filter element, you
must reset the gauge by pressing the reset
button.

After operating your vehicle during in heavy
snowfall or extreme rain, do the following:
•

Snow: At the earliest opportunity, open
the hood and clear any snow and ice
from the air filter housing inlet and
reset the air filter restriction gauge.

•

Extreme rain: The air filter element
dries out after approximately 15–30
minutes of driving at highway speeds.
At the earliest opportunity, open the
hood and reset the air filter restriction
gauge.

Note: Do not remove the foam filter.

CHANGING THE ENGINE-
MOUNTED AND DIESEL FUEL
CONDITIONER MODULE FUEL
FILTERS - 6.7L DIESEL

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.

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 567).

Use only recommended service parts
conforming to specifications. See
Motorcraft Parts (page 415).

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.

E226475

2

2. The diesel fuel conditioner module is

on the left-hand frame rail.

3

E226212

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.

4

5

6

E226213

4. Disconnect the electrical connector.

5. Fully loosen the bolts securing the

lower portion of the diesel fuel
conditioner module housing.

Note: Do not fully remove the bolts from
the lower portion of the diesel fuel
conditioner module housing.

6. Remove the lower portion of the diesel

fuel conditioner module housing.

7

E226563

7.

Slide the filter element toward the
drain plug to disengage the securing
clips.

Installation

1.

Slide the filter element into the housing
and fully engage the securing clips.

2. Install the lower portion of the housing.

Tighten the bolts until you feel a strong
resistance. Maximum torque 7 lb.ft
(9 Nm).

3. Connect the electrical connector.

4. 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.

5. 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

E226215

1

1.

Disconnect the fuel lines by squeezing
the connector tabs and pulling the lines
straight off.

E226214

2

3

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.