Issued June 2020
Compressed Natural Gas (CNG) Option
Copyright 2020, Heil Environmental
Printed in U.S.A.
227
PRE-TRIP INSPECTION
Perform a Pre-Trip Inspection each day before driving the
vehicle.
1. Verify the Manual Shut-Off Valve on the FMM is in
the ON position.
2. Check the high-pressure gauge on the FMM to
ensure it is operating and reading in a range
consistent with the fuel gauge on the dash board.
The fuel system maximum pressure is 3,600 psi.
NOTE: Pressure of less than 250 psi could make the
engine run rough.
3. Check the vent ports and vent caps for any signs the
PRDs have been activated. Verify the vent ports and
vent caps are clear of debris or damage.
4. Check the entire fuel system for any signs of damage
or wear. Include checks for:
a. Gas leaks – Smell for gas, look for frost or ice, and
listen for hissing noises at joints and components.
b. Look for external damage to housings and covers.
5. Drain the low pressure filters per the engine
manufacturer’s recommendation.
6. Turn the ignition key to ON and check that the low
pressure gauge reading is approximately 125 psi.
7. Verify the dashboard fuel gauge is functioning
properly.
5. Have the fuel system and cylinders inspected by a
certified CSA Cylinder and Fuel System Inspector if
damage is found on any part of the components or
structural parts of the fuel system.
WEEKLY SYSTEM INSPECTION
Perform the Weekly System Inspection to ensure the
system is operating correctly, safely, and to maximize
component performance.
1. Verify all of the cylinder Manual Shut-Off Valves
move freely and are in the ON position.
2. Visually inspect the fuel system for any signs of
damage or wear.
3. Check for damage on the cylinder shields and
covers.
4. Check to ensure the cylinders are mounted securely.
Inspect the mounts, brackets, rubber isolators, and
all fasteners.
5. Check for leaks on all CNG fuel plumbing tubes,
hoses, and fuel flow components. Check for the odor
of rotten eggs. Look for frosting or the sound of
hissing at valves and fittings.
6. If any system components or structural parts are
damaged, the system and cylinders must be
inspected by a CSA-certified fuel system inspector.
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