47–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.
47–01 Fuel Filter Replacement
For engine-mounted fuel filter replacement, refer to
the engine manufacturer’s service manual for re-
moval and installation procedures.
47–02 Fuel/Water Separator
Element Checking and
Replacement
Alliance/Racor
The only maintenance necessary on an Alliance or
Racor fuel/water separator is to replace the filter
element.
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.
Drain off some fuel by loosening the vent plug
and opening the drain valve.
2.
Disconnect the water sensor and heater connec-
tions if equipped.
3.
Remove the element and bowl together, by turn-
ing counterclockwise.
4.
Remove the bowl from the element and clean
the O-ring land.
5.
Apply a coating of clean fuel or motor oil to the
new O-ring and element seal.
6.
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.
7.
Connect the water sensor and heater connectors
if equipped.
8.
If equipped with a primer pump, prime the
fuel/water separator as follows.
8.1
Loosen the vent plug. Then operate the
primer pump until the fuel purges at the
vent plug. See
8.2
Close the vent plug.
9.
Start the engine and check for fuel leaks.
10. Shut down the engine and correct any fuel leaks.
Davco Fuel Pro® 382 and 482
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.
Fuel
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