Dover HEIL Command-SST - Starting Vehicle; Fueling Procedure

Issued June 2020
Compressed Natural Gas (CNG) Option
Copyright 2020, Heil Environmental
Printed in U.S.A.
216
STARTING VEHICLE
NOTICE
Starting a natural gas vehicle requires a delay between the
battery power being turned on and the starter motor being
activated.
1. Make sure that the system has been properly leak
tested and that no leaks exist.
2. Make sure that plastic caps are installed on all
exposed vent lines. For tailgate mounted CNG, vent
lines route to the top of the tailgate. If the plastic caps
are missing, contact Heil Parts Central for
replacement caps (Part Number 042-2078 for 3/8"
and 042-2079 for 1/2") at 800-528-5308.
3. Make sure that the cylinder shut-off valves (one on
each cylinder) are “OPEN” and the manual shut-off
valve is “ON”.
4. Without starting the engine, turn the key to the “RUN”
position and wait 20-30 seconds. This will allow the
fuel to properly fill the system and provide adequate
back-pressure for the high-pressure solenoid valve to
function properly.
5. Start the engine.
6. If this is the first start of the day, let the vehicle idle for
five minutes. This will allow coolant to warm the fuel
and ensure that the low-pressure lines down-stream
of the primary pressure regulator do not freeze up. On
extremely cold days, the vehicle may have to idle for a
longer period until the fuel warms adequately.
FUELING PROCEDURE
A.CNG Fueling Steps
Two options exist for filling a vehicle with CNG – timed
fill or fast fill. Despite the size of the receptacle, the
fueling hose connects in the same manner for either
type of fill.
WARNING
BEFORE fueling the CNrG Solenoid System (if equipped),
Fuel Fill Mode
Diagnostic Display. While Fuel Fill Mode is engaged, the
system will not detect leaks.
The steps include:
1. For the CNrG Solenoid System only, engage Fuel
Fill Mode
For more information, see Fuel Fill Mode .
2. Locate the fueling fill receptacle in the CNG fuel
module. Optional fill receptacles may be installed in a
remote location on the vehicle's front bumper.
3. Remove the dust cover on the fill receptacle.
4. Remove fueling nozzle from the CNG dispenser
holder.
5. Begin fueling the CNG vehicle.
6. When complete, disengage the Fueling Nozzle.
7. Return the nozzle to the CNG dispenser.
8. Replace the dust cover on the receptacle.
9. Close the CNG fuel module door and engage door
lock.
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