freightliner BUSINESS CLASS M2 100 Maintenance Manual Download

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Spin the bowl onto the new element, then spin
them both onto the filter head, snugly, by hand
only.

IMPORTANT: Do not use tools to tighten the
bowl and element.

Connect the water sensor and heater connectors
if equipped.

If equipped with a primer pump, prime the
fuel/water separator.

8.1

Loosen the vent plug. Then operate the
primer pump until the fuel purges at the
vent plug.

8.2

Close the vent plug.

Start the engine and check for fuel leaks.

10. Shut down the engine and correct any fuel leaks.

DAVCO Fuel Pro® 382

In the event of an emergency, when the filter needs
replacement but a DAVCO filter is not available, a
temporary filter can be used. For instructions, see

Chapter 13

of the

Business Class® M2 Driver’s

Manual

WARNING

Fluid circulated through the fuel/water separator
to heat the fuel may be diesel fuel returned from
the engine, or engine coolant. Drain the fuel/water
separator only when the engine and fluids have
cooled. Draining it when the engine is hot could
cause severe personal injury due to scalding.

If returning fuel is released into the atmosphere,
its vapors can ignite in the presence of any igni-
tion source. Do not expose the fuel to, or work
with the fuel system near, open flame or intense
heat. To do so could cause fire, possibly resulting
in serious personal injury or property damage.

The filter element should be changed only when the
fuel level has reached the top of the filter element.
There is no significant restriction to fuel flow until the
element is completely clogged.

Shut down the engine, apply the parking brake,
and chock the tires.

Check the fuel level in the fuel filter. Replace the
fuel/water separator element

only

when the filter

element is completely covered. If the fuel level

has reached the top of the filter element, follow
the procedure below to replace the element.

Put a clean receptacle under the fuel/water sepa-
rator and attach a piece of hose to the drain
valve, to direct fuel into the receptacle.

The drain valve has a 1/2-inch (12.7-mm) pipe;
use a hose with a 1/2-inch pipe thread to fit cor-
rectly.

Remove the vent cap (

Fig. 2

, Item 10) and open

the drain valve (

Fig. 2

, Item 1) to drain the fuel

completely, then close the drain valve.

Using a DAVCO Collar Wrench, shown in

Fig. 3

remove the clear cover and collar.

NOTE: Broken vent cap and collar warranty
claims will not be accepted if any tool other than
a DAVCO Collar Wrench is used for removal.
During installation, the vent cap is to be

hand-

tightened only

, not tightened with a wrench.

Use part number 482017 on Fuel Pro 482 units;
part number 380134 on Fuel Pro 382 units.

Remove the filter, cover O-ring, and vent cap
O-ring. Dispose of them in an environmentally
acceptable manner. See

Fig. 2

Clean all threads and sealing surfaces very thor-
oughly. Even a small amount of dirt will prevent
the fuel/water separator from sealing, and an air
leak may result.

Install the grommet on the bottom of the new
filter.

Install the new filter and grommet assembly and
cover O-ring on the housing.

10. Install the clear cover and the collar. Simultane-

ously apply downward pressure to the top of the
clear cover until it is seated on the body of the
lower housing and hand tighten the collar until it
no longer spins freely. Using the collar wrench,
tighten the cover 18 lbf·ft (24 N·m). This is
equivalent to rotating the collar clockwise two or
three additional ribs, depending on the specific
filter model.

11. Prime the system.

11.1

Ensure that the drain valve is closed.

11.2

Fill the housing to the top of the filter ele-
ment with clean diesel fuel.

Fuel

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