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48-00
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FUEL INSTALLATION
The fuel supply should be as close as possible to the engine.
This will reduce the installation cost of fuel runs. The information
in this manual is offered to assist you in providing the proper fuel
for your engine. However, this information is only provided to
inform you of the engine’s requirements and assist in making you
aware of the decisions you must make. In no case should the
instructions or information provided be interpreted to conflict with
any local, state or national codes. If in doubt, always consult
your local fire marshal or gas supplier.
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***** WARNING *****
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FIRE HAZARD
- All fuel runs should be installed by a licensed
fuel supplier.
Connect the fuel supply to the inlet of the fuel solenoid (see
table for recommended line size). The pressure at the demand
regulator must be four to six ounces per square inch or 7 to 11
inches W.C. (Water column) on
vapor withdrawal units. On units
equipped with liquid withdrawal fuel systems full tank pressure
is plumbed to the fuellock strainer mounted on the generator
rails. The fuel converter mounted on the unit will handle both
vaporization of the fuel and pressure reduction.
INSTALLING THE FUEL LINE
** NOTICE **
The engine generator sets are properly adjusted before they
leave the factory for a specific fuel, either NG (natural gas), LP
(liquid propane vapor) or LPG (liquid withdrawal propane). This
fuel type is noted in your model number. If it becomes necessary
to change the fuel type in the field see information on page 16.
Line Size
(vapor system)
Unit location will determine the size of fuel line that is required
to supply the engine with a constant fuel pressure. Refer
to the tables below for fuel line size, fuel consumption and
recommended tank size. For distances of 5 feet and over, a
two regulator fuel system is recommended. This is accomplished
by installing a primary regulator at the tank which will reduce the
tank pressure down to 10 to 15 lbs. A secondary regulator is
installed to further reduce the fuel pressure to the required six (6)
oz operating pressure. This secondary regulator must be at least
10 feet from the engine generator set. Any closer installation
will require a larger line be installed to provide a fuel reservoir.
If this is not done, the demand regulator on the unit and the
pressure regulator in the fuel line will interfere with each other.
When this two (2) stage regulator system is used, a fuel line size
of 3/4 to 1 inch is generally adequate for distances up to 300 feet
from the primary to the secondary regulator. (Consult your local
fuel supplier for your exact requirements). The appropriate line
size from the table below is then installed from the secondary
regulator to the generator set.
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***** WARNING *****
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PERSONAL DANGER
- Do not use galvanized pipe in fuel line
runs. The galvanized coating can become eroded and flake off,
causing possible obstructions in the regulator or fuel valve. The
results could range from inoperative engine start to hazardous
fuel leaks.
Size of pipe normally required for generators operating on NG/
LP:
UP TO
5 FEET*
OVER
5 FEET
PSS60
1.5” pipe
NOT
RECOMMENDED**
PSS90
1.5” pipe NOT
RECOMMENDED**
* Allow an additional 3 feet for each standard elbow.
Do not use ‘street ells’ (restrictive).
** USE THE TWO REGULATOR SYSTEM SHOWN BELOW.
**** CAUTION ****
EQUIPMENT DAMAGE -
Be careful when sealing gas line joints.
Excessive sealing compound can be drawn into the solenoid,
regulator or carburetor causing an engine malfunction.
FUEL PRESSURE
(vapor system)
Correct fuel pressure cannot be stressed enough. The most
common cause for inoperative systems is an inadequate or
incorrect fuel pressure. Power and performance of the engine
is in direct relation to the correctness of the fuel system. Shown
below is a diagram of a typical L.P. or N.G. installation.
Reference numbers 1 through 3 in the diagrams below are
system parts supplied by customer.
Reference number 4 is the engine generator set.
Below is a table of the fuel pressure reading at each reference in
the system.
Fuel Pressure Table
