Freightliner FLA/FLB/FLC/FLD/FLL. Manual - part 37

Racor 6400

WARNING

Diesel fuel is flammable and can ignite if exposed
to an open flame, intense heat, or other ignition
source. Do not drain fuel near, or expose fuel
vapor to open flame or intense heat. Exposure to
open flame or intense heat could start a fire, pos-
sibly resulting in personal injury or property dam-
age. When working on a fuel system, have a fire
extinguisher within easy reach.

Disconnect the water sensor probe connector
and bowl heater connector, if equipped. See

Fig. 7

Place a suitable container under the fuel
heater/water separator, then drain the fuel from

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T-Handle

Lid

Lid Gasket

Filter Element

Fig. 6, Racor 900FG Fuel Heater/Water Separator

(1000FG similar)

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Fuel Inlet

Head Assembly

Filter Top Seal

Filter Element

Bowl O-Ring Seal

Water Sensor Probe
Plug

Water Sensor Probe

Bowl Heater
Connector

Drain Valve

10. Contaminant

Collection Bowl

11. Fuel Outlet
12. Priming Plug

Fig. 7, Racor 6400 Fuel Heater/Water Separator

Fuel

47/6

the fuel heater/water separator by opening the
drain valve.

Remove the filter element and collection bowl
together, by turning the filter element off of the
mounting head.

Remove the filter element from the collection
bowl by turning the collection bowl; then discard
the filter element.

Remove and discard the bowl O-ring; then clean
the bowl of debris using diesel fuel only. Clean
the bowl O-ring seat with a shop cloth.

Lubricate the new bowl O-ring with clean diesel
fuel or motor oil; then seat it into the collection
bowl.

Attach the collection bowl to a new filter element,
hand-tight. Do not use tools.

Lubricate the new filter element gasket with
clean diesel fuel or motor oil.

Spin the filter and bowl assembly onto the
mounting head until the gasket contacts the head
base; then turn it an additional 1/3 to 3/4 of a
turn.

10. Connect the water sensor probe connector and

bowl heater connector, if equipped.

11. Remove the priming plug located at the top of

the fuel/water separator and manually fill the
fuel/water separator with clean diesel fuel. Install
and tighten the priming plug

12. Start the engine and check for fuel and coolant

leaks. Repair all leaks with the engine OFF.

Davco Fuel Heater/Water
Separator Filter Element
Replacement

Davco 321

The only maintenance necessary on Davco 321 fuel
separators is to replace the filter element. See

Fig. 8

WARNING

Diesel fuel is flammable and can ignite if exposed
to an open flame, intense heat, or other ignition
source. Do not drain fuel near, or expose fuel
vapor to open flame or intense heat. Exposure to

open flame or intense heat could start a fire, pos-
sibly resulting in personal injury or property dam-
age. When working on a fuel system, have a fire
extinguisher within easy reach.

Place a suitable container under the fuel
heater/water separator. Open the filter vent using
a 1-1/8 wrench; then drain the fuel from the fuel
heater/water separator by opening the drain
valve.

Close the drain valve.

Remove the filter element by spinning the filter
element off of the fuel heater/water separator
body.

Remove the filter stud seal; then clean the top of
the unit body.

Add fuel to the fuel heater/water separator hous-
ing until it reaches the top of the fuel port.

Install a new filter stud seal.

Coat the filter gasket with clean oil. Spin the filter
element onto the unit housing unit it contacts the
gasket; then turn it 1/2 to 3/4 turns more. Do not
use a filter wrench to tighten the filter

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Filter Vent

Filter Element

Filter Stud Seal

Filter Stud

Davco Unit Body

Fuel Port

Fig. 8, Davco 321

Fuel

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Start the engine, then raise the rpm for 1 to 2
minutes to purge air from the system and check
for fuel leaks.

Shut down the engine and correct any fuel leaks.

Davco 380

The only maintenance necessary on Davco 380 fuel
separators is to replace the filter element. See

Fig. 9

WARNING

Note: As an emergency option, the Davco 380
will accept a spin-on type filter onto its threaded
filter stud with the grommet removed.

Place a suitable container under the fuel
heater/water separator. Open the filter vent.
Drain the fuel below the collar level by opening
the drain valve; then close the drain valve.

Remove the filter collar using the Davco filter
collar wrench. See

Fig. 10.

Remove the filter cover. Retain the filter cover
seal for re-use.

Remove the filter element; remove the grommet
from the element; then discard the element. Re-
tain the grommet for re-use.

Add fuel to the fuel heater/water separator hous-
ing until it reaches the top of the fuel port.

Install the grommet on the new filter element.

CAUTION

Do not use the filter collar wrench to tighten the
filter collar. Using the filter wrench to tighten the
collar can damage the collar, resulting in a fuel
leak.

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Filter Vent

Filter Vent Seal

Filter Spring

Filter Element

Filter Cover

Filter Collar

Filter Cover Seal

Grommet

Threaded Filter Stud
(for emergency use)

10. Fuel Port
11. Davco Unit Body
12. Drain Valve

Fig. 9, Davco 380

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VENT CAP

FOR REMOVAL OF TOP COLLAR ONLY

Fig. 10, Davco Filter Collar Wrench (Davco P/N 380134)

Fuel

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Install the filter element, filter cover and cover
seal, and filter collar. Hand-tighten the filter col-
lar.

Remove the filter vent; then fill with fuel until fuel
is about 1 inch above the collar. Install the filter
vent.

Start the engine, then raise the rpm for 1 minute
to purge air from the system and check for fuel
leaks.

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

Fuel

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