freightliner BUSINESS CLASS M2 100, Руководство по обслуживанию

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4. Remove the element, bowl O-ring, and element
o-ring. Dispose of them in an environmentally
acceptable manner.
5. Thoroughly clean all of the threads and sealing
surfaces. Even a small amount of dirt will prevent
the fuel/water separator from sealing, and an air
leak may result.
6. Apply a coating of clean fuel or motor oil to the
new O-ring and to the new element o-ring.
7. Insert the new element into the upper housing.
IMPORTANT: Do not use tools to tighten the
bowl and element.
8. Spin the bowl onto the onto the upper housing
by hand only.
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.
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
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,
steam cleaner, or silicone-based chemicals on the
gas detection sensors, as this may permanently
disable the sensors. When cleaning the vehicle,
cover the sensors with a plastic covering. Keep
the sensors covered until the area has been
cleared of any cleaning fumes. Harsh chemicals
and extremely high temperatures may damage the
sensor.
Fuel Tank and Shroud Inspecting
See Fig. 7 for fuel tank and shroud component
locations.
1. Inspect the fuel tank outer shell for dents or
other signs of damage. Inspect the bottom of the
tank for deep scratches, flat spots, or gouges.
Replace a leaking fuel tank.
2. Ensure that the fuel tank is secured to its mount-
ing brackets and that the mounting brackets are
secured to the frame. Inspect for any signs of
looseness.
3. Ensure that all rubber isolator straps are present
and secure.
4. Look for signs of abrasion between the fuel tank
and mounting brackets.
5. Inspect the fuel fill fitting for signs of damage or
leaks. Ensure the fuel fill cap is present and in
good condition, and the fitting is mounted se-
curely on the tank.
6. Inspect the fuel outlet line and fitting for signs of
leaks or damage.
7. Inspect the primary relief vent and pipe-away line
for damage, kinks, chafing, or loose connections.
8. Inspect the fill vent fitting for signs of damage.
Fuel
47
Business Class M2 Maintenance Manual, March 2018
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