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Fuel
13. Start the engine. When the lubricating oil
reaches its normal operating pressure, increase
engine speed to high idle for one to two minutes
to purge air from the system.
14. Check for leaks and shut down the engine.
47–03 Fuel Tank Band-Nut
Tightening
Hold each fuel tank band retention nut with a wrench
while backing off its jam nut, then tighten the reten-
tion nuts 30 to 35 lbf·ft (41 to 46 N·m). After the re-
tention nuts have been tightened, hold each retention
nut with a wrench while tightening its jam nut 30 lbf·ft
(41 N·m).
IMPORTANT: Do not overtighten.
47–04 LNG Fuel System
Inspecting
WARNING
As with all pressure vessels, CNG/LNG storage
and fuel delivery systems are inherently danger-
ous and should be treated as such. Beyond the
visual inspections listed below, all maintenance
and repairs to compressed natural gas (CNG) or
liquified natural gas (LNG) systems should be per-
formed by trained personnel. Individuals who are
not trained in all aspects concerning CNG/ LNG
fuel delivery systems are not permitted to service,
maintain, test, or inspect a system in any way.
Failure to comply with safety regulations may lead
to fire or explosion, resulting in property damage,
personal 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-
Cascadia Maintenance Manual, August 2015
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. 6
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.
9. Inspect the shroud cover for dents or other signs
of damage. Ensure that the shroud cover latches
are in working condition and fasten the shroud
cover securely to the tank.
10. Replace leaking or damaged fuel lines. Repair or
replace leaking or damaged fittings.
47
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