Freightliner Business Class M2. Manual — part 29
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 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 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. See
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 gland.
5.
Apply a coating of clean fuel or motor oil to the
new O-ring and element seal.
5
4
3
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1.
Mounting Head
2.
Fuel Primer Pump
3.
Vent Plug
4.
Bowl O-Ring
5.
Bowl Gasket
6.
Bowl Probe Plug
7.
Water Sensor Probe
8.
Heater Connector
9.
Drain Plug
10. Sight Bowl
11. Filter Element
Fig. 1, Alliance Fuel/Water Separator
Fuel
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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.
8.1
Loosen the vent plug. Then operate the
primer pump until the fuel purges at the
vent plug.
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® 232 and 233
Replace the fuel/water separator element (
only when the filter element is completely covered.
In the event of an emergency, when the filter needs
replacement but a Davco filter is not available, a
temporary filter can be used. For instructions, see
Chapter 14 of the Business Class® M2 Driver’s
Manual.
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 the fuel below the collar level.
2.
Using Davco wrench 232002, remove the filter
collar. Then remove the filter cover.
3.
Remove the element and dispose of it properly.
4.
Install a new element. Make sure the grommet is
in place on the filter stud.
5.
Install a new cover seal on the filter cover.
6.
Using the collar, attach the filter cover with the
spring to the base.
IMPORTANT: Tighten the collar by hand only.
7.
Remove the filter vent. Then fill the fuel/water
separator with fuel until the fuel level is 1 inch
(2.5 cm) above the collar.
8.
Install the filter vent on the fuel/water separator.
9.
Start the engine and raise the rpm for one min-
ute to purge air.
Davco Fuel Pro® 382
Replace the fuel/water separator element only when
the filter element is completely covered.
In the event of an emergency, when the filter needs
replacement but a Davco filter is not available, a
temporary filter can be used. For instructions, see
Chapter 13 of the Business Class® M2 Driver’s
Manual.
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 the fuel below the collar level. See
2.
Using Davco wrench 380134 or 382002, remove
the filter collar. Then remove the filter cover.
3.
Remove the element and dispose of it properly.
4.
Install a new element. Make sure the grommet is
in place on the filter stud.
5.
Install a new cover seal on the filter cover.
6.
Using the collar, attach the filter cover with the
spring to the base.
IMPORTANT: Tighten the collar by hand only.
7.
Remove the filter vent. Then fill the fuel/water
separator with fuel until the fuel level is 1 inch
(2.5 cm) above the collar.
8.
Install the filter vent on the fuel/water separator.
Fuel
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9.
Start the engine and raise the rpm for one min-
ute to purge air.
47–03 LNG Fuel System
Inspecting
WARNING
Natural gas is highly flammable. See the safety
precautions listed in Chapter 16 of the Business
Class® M2 Driver’s Manual or Group 47 of the
Business Class® M2 Workshop Manual. Failure to
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5
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7
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11
12
10
1.
Filter Vent
2.
Vent Seal
3.
Filter Collar
4.
Filter Cover
5.
Cover Seal
6.
Filter Spring
7.
Filter Element
8.
Temporary Filter Stud
9.
Fuel Outlet
10. Check Valve Fuel Inlet
11. Drain
12. Electric Filter Preheater
(optional)
Fig. 2, Davco Fuel Pro® 232 and 233
Fuel
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observe these precautions could lead to the igni-
tion of the natural gas, which could cause serious
bodily injury or death.
The following inspections must be performed by a
qualified technician, in accordance with the manufac-
turer’s established inspection criteria.
All tank components should be allowed to defrost
before conducting the following inspections.
NOTICE
Do not use a high-pressure washer or steam
cleaner on natural gas fuel system plumbing com-
ponents, as this can introduce moisture and con-
taminants into the threads of the fittings and dam-
age the sealants.
Gas detection sensors are located on the cab
overhead console and in the engine compartment
on the frontwall. The sensors are located in high
areas, where rising gas vapors will pass by or ac-
cumulate. Do not use a high-pressure washer,
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3
1.
Filter Collar
2.
Filter Vent
3.
Vent Seal
4.
Filter Cover
5.
Cover Seal
6.
Filter Spring
7.
Filter Element
8.
Temporary Filter Stud
9.
Check Valve Fuel Inlet
10. Fluid Heater/Bottom Plate and
Seal
11. Drain
12. Bottom Plate Collar
13. Electric Heater (optional)
Fig. 3, Davco Fuel Pro® 382
Fuel
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