Thomas SAF-T-LINER C2, Maintenance Manual

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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.
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).
47–02 Fuel/Water Separator
Element Replacing
Alliance
The only maintenance necessary on an Alliance
fuel/water separator is to replace the filter element.
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.
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 so equipped.
3. Remove the element and bowl together by turn-
ing counterclockwise.
4. Remove the bowl from the element and clean
the O-ring gland.
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 so equipped.
8. If equipped with a primer pump, loosen the vent
plug. Then operate the primer pump until the fuel
purges at the vent plug. See
Fig. 1 .
Close the vent plug.
9. Start the engine and check for fuel leaks.
10. Shut down the engine and correct any fuel leaks.
DAVCO Diesel Pro® 245
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.
Fuel
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Saf-T-Liner C2 School Bus Maintenance Manual, March 2019
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