Winco PSS8B4W/A - Manual (Page 7)

PAGE 5 4023-50 60706-166
**** CAUTION ****
Be careful when sealing gas joints. Excessive sealing
compound can be drawn into the solenoid, regulator or
carburetor causing an engine malfunction.
FUEL PRESSURE
L.P. & N.G. VAPOR FUEL
Correct fuel pressure cannot be stressed enough. The
most common cause for inoperative systems is an
inadequate or incorrect fuel pressure. 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. vapor fuel installation.
Notice the following tables give two (2) different units of
measuring fuel pressure. The first and most accurate is
the use of a simple water manometer. A manometer is
calibrated in inches of water column. The second is with
a pressure gauge calibrated in ounces per square inch.
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
Natural Gas
1 3 4
UNIT OFF LINE PSI 7-11 in 7-11 in
4-6 oz 4-6 oz
STARTING LINE PSI 7-11 in 7-11 in
4-6 oz 4-6 oz
NO LOAD LINE PSI 7-11 in 7-11 in
4-6 oz 4-6 oz
FULL LOAD LINE PSI 7-11 in 7-11 in
4-6 oz 4-6 oz
LP/NG FUEL CONVERSION
These generator sets are factory tested on Natural Gas
and will require no modifications for normal operation on
Natural Gas. The carburetion system has been preset
and anti-tamper plugs have been installed in the carbure-
tor as required by EPA.
If you are operating on LP fuel you will have to make
the following modification: On the left side of the engine,
above the starter there is a small two wire connector
lying loose. This connector has to be plugged into the
mating two wire connector coming out of the carburetor
area on the left side of the unit. This connection will
engage an orifice in the carburetor allowing the unit to
operate on Liquid Propane Vapor fuel. NO other
adjustments are required.
If you are reinstalling a unit that has been operat-
ing on Liquid Propane vapor and you now want to
operate it on Natural Gas all that you will need to do is
unplug this connector.
LUBRICATION
Before starting the engine, fill the crankcase with the
proper weight/grade of oil, as recommended by the
engine manufacturer’s maintenance instructions. The
necessity of using the correct oil, and keeping the
crankcase full cannot be over emphasized.