8
60706-237/G
NG FUEL
The information in this manual is offered to assist you in
providing the proper vapor fuel supply for your engine. This
information is only provided to advise you of the engine’s
requirements and the decisions you must make. In no case
should this information be interpreted to conflict with any
local, state, or national codes. If in doubt, always follow local
codes.
DANGER: FIRE/PERSONAL INJURY
All fuel lines must be installed by a qualified fuel
supplier.
The fuel source should be as close as possible to the
outdoor operating location. This will reduce the installation
cost of fuel runs. Connect the fuel supply line to the inlet
of the fuel demand regulator on the unit using a locally
approved flexible fuel line (see table for recommended line
size). The pressure supplied to the demand regulator must
be 4 to 6 ounces or 7 to 11 inches w.c. (water column).
The primary regulator at the fuel supply must be capable of
delivering the proper volume of fuel at this pressure.
Have your local fuel supplier install a protected fuel
connection at the outside operating location. They should
also install a lockable fuel shut off valve at the connection
point. An approved flexible fuel line must be installed
between the engine generator set and the supply line.
DANGER: FIRE/PERSONAL INJURY
The NG fuel supply line must always be shut off when
the engine is not running. Failure to do so may allow
fuel to leak at the unit.
INSTALLING THE FUEL LINE
DANGER: PERSONAL INJURY
Units that are intended to be run unattended MUST
have an electric fuel solenoid installed. This solenoid
MUST be wired to AUTOMATICALLY turn off the fuel
whenever the engine stops.
Unit location will determine the size of fuel line the
is required to supply the engine with a constant fuel
pressure. Refer to the tables below for fuel line size and
recommended tank size. For distances of 100 feet and over,
a two regulator fuel system is recommended. This system
consisting of a primary 10-15# regulator at the tank and a 6
ounce secondary regulator installed about 10 feet from the
generator. You need to run a 3/4 inch line or larger from
the secondary regulator to the engine-generator set. When
a two (2) regulator fuel system is used, a fuel line size of 3/8
inch is generally adequate for distances up to 300 feet, The
line size from the table below applies to the distance from
the second regulator to the demand regulator. A positive
fuel shut-off device must be installed in the fuel line close
to the engine-generator set. This manual shut-off valve
is required by code even if the 12 Volt fuel solenoid kit is
installed. This optional 12 Volt DC valve is available through
your local WINCO dealer and can be used to shut off during
normal periods of operation without having to shut off the
manual valve.
The fuel line used to connect the supply line to the demand
regulator must be a locally approved flexible fuel line.
Products used will vary in different regions depending on
availability and local codes. Consult with your local fuel
supplier to ensure complete compliance with ALL codes.
1. Remove the plastic cover plug from the demand
regulator.
2. Connect the flex fuel line to the demand regulator or
the optional solenoid.
DANGER: PERSONAL INJURY
Do NOT use galvanized pipe in the fuel line runs. The
galvanized coating will become eroded and flake
off, causing possible obstruction or damage to the
regulator or fuel valve. The obstruction could cause an
inoperative engine or an explosive fuel leak.
Size of pipe required for generators operating on NG gas.
Length of fuel line* Fuel line size
Less than 25 feet
3/4/ in black pipe
25-100
Feet
1
in
black
pipe
Over
100
feet Not
recommended**
*Allow an additional 3 feet for each standard elbow. Do not
use ‘street ells’ (restrictive).
**Consult factory for fuel run over 100 feet.
DANGER: FIRE/PERSONAL INJURY
Be careful when sealing gas joints. Excessive sealing
compound can be drawn into the solenoid, regulator,
or carburetor causing an engine malfunction or
dangerous fuel leak.
FUEL CONSUMPTION
(Full Load)
Gasoline 1
gal/hr
Natural Gas
160 ft
3
/hr
163,200
BTU/hr
FUEL PRESSURE
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. The following diagram is of a typical NG installation.
LP VAPOR
Reference numbers 1 and 3 in the previous diagram are
system parts supplied by the customer. Reference number 4
is the engine-generator set. The following table is of the fuel
pressure reading at each reference in the system.
Single Regulator (LP only)
7
13240-11
60706-236
The fuel line used to connect the supply line to the
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fuel line. Products used will vary in different regions
depending on availability and local codes. Consult
with your local fuel supplier to ensure complete com-
pliance with ALL codes.
1. Remove the plastic cover plug from the demand
regulator.
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or the optional fuel solenoid..
DANGER: PERSONAL INJURY
Do not use galvanized pipe in the fuel line runs.
The galvanized coating will become eroded and
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to the regulator or fuel valve. The obstruction could
cause an inoperative engine or an explosive fuel
leak.
Size of pipe required for generators operating on
natural gas/LP gas.
Length of Fuel Line* Fuel Line Size
less than 25 feet
3/4 inch black pipe
25 to 100 feet
1 inch black pipe
over 100 feet
not recommended**
*allow an additional 3 feet for each standard elbow.
Do not use ‘street ells’ (restrictive)
** Consult factory for fuel runs over 100 feet.
DANGER! - FIRE - PERSONAL INJURY -
Be careful when sealing gas joints. Excessive
sealing compound can be drawn into the solenoid,
regulator or carburetor causing an engine malfunc-
tion or dangerous fuel leak
.
FUEL CONSUMPTION (Full Load)
Gasoline
1.67 Gal/HR
LP Vapor
2.2 Gal/HR
200,932 BTU/HR
Natural Gas
200 cu ft/hr
200,000 BTU/HR
FUEL PRESSURE
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
above 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
Single Regulator (L.P. Vapor only)
1
3
4
UNIT OFF
TANKPSI
7-11 in
7-11 in
4-6 oz
4-6 oz
STARTING
TANK PSI
7-11 in
7-11 in
4-6 oz
4-6 oz
NO LOAD
TANK PSI
7-11 in
7-11 in
4-6 oz
4-6 oz
FULL LOAD
TANK PSI
7-11 in
7-11 in
4-6 oz
4-6 oz
Two (2) Regulator System (L.P. Vapor only)
1
2
3
4
UNIT OFF
TANK PSI 10-15 lbs
7-11 in
7-11 in
4-6 oz
4-6 oz
STARTING
TANK PSI 10-15 lbs 7-11 in
7-11 in
4-6 oz
4-6 oz
NO LOAD
TANK PSI 10-15 lbs 7-11 in
7-11 in
4-6 oz
4-6 oz
FULL LOAD
TANK PSI 10-15 lbs 7-11 in
7-11 in
4-6 oz
4-6 oz