If more than approximately one ounce of oil or
other contaminants is found, have the system
checked at a qualified service center.
Weekly Post-Trip Inspections
and Maintenance
Engine Compartment Inspection
WARNING
Washer fluids may be flammable and poisonous.
Do not expose washer fluid to an open flame or
any burning material, such as a cigarette. Always
comply with the washer fluid manufacturer’s rec-
ommended safety precautions.
1.
Check the windshield washer reservoir fluid level.
The reservoir is usually located near the right-
hand frame rail. See
Fig. 21.11.
02/04/2014 f470617
1
2
3
6
8
9
11
12
4
5
7
10
1. Pressure Control Regulator
2. Coalescing Filter
3. Fuel Fill Fitting
4. Vapor Shutoff Valve
5. Secondary Relief Valve (red cap)
6. Fill Vent Fitting
7. Primary Relief Valve
8. Tank Pressure Gauge
9. Fuel Shutoff Valve (liquid)
10. Fuel Level Sender Box
11. Cover
12. Fill Check Valve
Fig. 21.9, LNG Tank Plumbing Components
H
I
G
H
PR
E
S
S
U
R
E
PR
E
S
S
U
R
E
L
O
W
CYLINDERS
INSPECT CYLINDERS
EVERY 36 MONTHS
OR 36000 MILES
WHICHEVER OCCURS FIRST
NATURAL
GAS
VEHICLE
110 PSIG
ON
M
A
N
U
A
L
S
H
U
T
O
F
F
V
A
L
V
E
OPEN VALVE
SLOWLY
3600 PSIG MAX.
SERVICE PRESSURE
REGULATOR
FILTER
INSPECT PRESSURE
RELIEF DEVICE
EVERY 2000 MILES
DRAIN HOUSING
EVERY 1500 MILES
REPLACE ELEMENT
EVERY 3000 MILES
1
2
3
4
04/30/2010 f470556
1. High Pressure Gauge
2. Low Pressure Gauge
3. Manual Fuel Shutoff Valve
4. Fuel Fill Port
Fig. 21.10, CNG Fuel Panel
Pre- and Post-Trip Inspections and Maintenance
21.10
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