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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 that 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 may be either a lockable
manual shut-off valve available from your local fuel installer,
or a 12 volt DC fuel solenoid valve. This optional 12 volt DC
valve is available through your local Winco dealer.
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 insure complete compliance with ALL codes.
1. Remove the pipe plug from the demand regulator.
2. Connect the flex fuel line to the demand regulator to
the optional fuel 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 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 malfunction or dangerous
fuel leak.
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 block diagram of a typical L.P.
or N.G. installation.
Reference numbers 1 through 3 in the block 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
TANK PSI 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
