freightliner 108SD 2021, Driver Manual

Page: 148 / 191

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 or motor, 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 cannot drop. Failure to follow these
steps could result in serious personal injury or
death.
47–01 Fuel Tank Band Nut
Tightening
IMPORTANT: Do not overtighten the nuts.
Rectangular Fuel Tank
Hold the retention nut on the fuel tank band with a
wrench while backing off the jam nut. Then tighten
the retention nut 13 to 17 lbf·ft (18 to 23 N·m). After
the retention nut has been tightened, hold the reten-
tion nut with a wrench while tightening the jam nut 13
to 17 lbf·ft (18 to 23 N·m).
Cylindrical Fuel Tank
Hold the retention nut on the fuel tank band with a
wrench while backing off the jam nut. Then tighten
the retention nut 30 to 35 lbf·ft (41 to 46 N·m). After
the retention nut has been tightened, hold the reten-
tion nut with a wrench while tightening the jam nut 30
to 35 lbf·ft (41 to 46 N·m).
47–02 Fuel/Water Separator
Element Check and
Replacement
Alliance/Racor
The only maintenance necessary on an Alliance or
Racor fuel/water separator is to replace the filter
element.
1. Shut down the engine, apply the parking brakes,
and chock the tires. Open the hood.
2. Place a suitable container under the fuel/water
separator.
IMPORTANT: When draining fluid from a
fuel/water separator, drain the fluid into an ap-
propriate container, and dispose of it properly.
Many states now issue fines for draining
fuel/water separators onto the ground.
3. Turn the drain plug counterclockwise to open it.
4. When the fuel/water separator is completely
drained, turn the drain plug clockwise to close it.
WARNING
Do not expose the fuel to open fire. Do not 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.
5. Disconnect the wiring harnesses from the water-
in-fuel sensor and, if equipped, the heater. See
Fig. 1 .
6. Spin off the sight bowl and the filter element as a
unit. Remove the O-ring from the top of the filter
element.
7. Remove the sight bowl from the filter element.
Clean the O-ring seating surface.
8. Apply a thin coating of clean diesel fuel or en-
gine oil to the O-rings.
9. Spin the sight bowl onto the new filter element
and then fill the filter element and sight bowl as-
sembly with clean diesel fuel.
10. Spin the entire assembly onto the mounting head
and tighten by hand until snug.
11. Connect the wiring harnesses for the water-in-
fuel sensor and, if equipped, the heater.
12. Prime the fuel/water separator, as follows.
If equipped with a primer pump, operate the
primer pump until fuel comes out at the drain.
If not equipped with a primer pump, fill the filter
element and sight bowl with clean fuel and crank
the engine until it starts.
13. Start the engine and check for leaks.
14. Shut down the engine and repair any leaks.
Fuel
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108SD and 114SD Maintenance Manual, May 2018
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