freightliner PE116DC, Maintenance Manual

Page: 138 / 164

9. Connect the water sensor and heater connectors
if equipped.
10. If equipped with a primer pump, prime the
fuel/water separator as follows.
10.1 Loosen the vent plug. Then operate the
primer pump until the fuel purges at the
vent plug.
10.2 Close the vent plug.
11. Start the engine and check for fuel leaks.
12. Shut down the engine and correct any fuel leaks.
DAVCO Fuel Pro® 485
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.
1. Shut down the engine, apply the parking brake,
and chock the tires.
2. 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.
3. 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.
On older models, the drain valve has a 1/2-inch
(12.7-mm) pipe with threads. Use a hose with a
1/2-inch pipe thread to fit correctly and open the
drain valve by turning it one-quarter revolution.
On new models, the drain valve has a 3/4-inch
(19-mm) slip-on hose connection; pipe threads
are no longer used. Open the drain valve by
turning it one to one-and-a-half revolutions.
4. Remove the vent cap, shown in Fig. 2 , to drain
the fuel completely, then close the drain valve.
5. 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 (part number 482017)
is used for removal. During installation, the vent
cap is to be
hand-tightened only , not tightened
with a wrench.
6. Remove the filter, cover O-ring, and vent cap
O-ring. Dispose of them in an environmentally
acceptable manner. See
Fig. 2.
7. 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.
8. Install the new filter and grommet assembly and
cover O-ring on the housing.
Position the filter element so the key is lined up
with the keyway on the separator plate of the
housing. Use the arrow on the top of the end-
plate to align the filter. See
Fig. 4 . Ensure the
filter element is fully seated by firmly pushing on
the endplate. The filter should not rotate freely.
9. 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.
10. Prime the system
10.1 Ensure that the drain valve is closed.
10.2 Fill the housing to the top of the filter ele-
ment with clean diesel fuel.
10.3 Install and hand-tighten the vent cap
O-ring and vent cap.
10.4 Start the engine. When the lubricating oil
reaches its normal operating pressure,
increase engine speed to high idle for
one to two minutes to purge air from the
system.
Fuel
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