7
11075-00 60706-211
NATURAL GAS or LP VAPOR PIPE SIZE
Size of pipe nomally required for generators operat-
ing on NATURAL GAS or LP VAPOR.
FEET SIZE OF PIPE
up to 25 FT* 3/4 “ Pipe
25 - 100 FT* 1” Pipe
over 100 FT* Use a two regulator
system.
* Allow an additional 3 feet for each standard
elbow. Do not use ‘street ells’ (restrictive).
**** CAUTION ****
Be careful when sealing gas joints. Excessive seal-
ing compound can be drawn into the solenoid, regu-
lator or carburetor causing an engine malfunction.
FUEL PRESSURE
LP & NG VAPOR FUEL Correct fuel pressure can-
not be stressed enough. The most common cause
for inoperative systems is an inadequate or incor-
rect fuel pressure. Performance of the engine is in
direct relation to the correctness of the fuel system.
Shown below is a diagram of a typical LP or NG
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 diagrams
above are system parts supplied by the customer.
Reference number 4 is on the generator.
Below are tables of the fuel pressure readings at
each reference in the system.
FUEL PRESSURE TABLES:
Single Regulator (LP Vapor only)
REF # 1 3 4
UNIT OFF TANK PSI 7-11 IN
4-6 OZ
7-11 IN
4-6 OZ
STARTING TANK PSI 7-11 IN
4-6 OZ
7-11 IN
4-6 OZ
NO LOAD TANK PSI 7-11 IN
4-6 OZ
7-11 IN
4-6 OZ
FULL
LOAD
TANK PSI 7-11 IN
4-6 OZ
7-11 IN
4-6 OZ
Two (2) Regulator System (LP Vapor only)
REF # 1 2 3 4
UNIT
OFF
TANK
PSI
10-15
LBS
7-11 IN
4-6 OZ
7-11 IN
4-6 OZ
START-
ING
TANK
PSI
10-15
LBS
7-11 IN
4-6 OZ
7-11 IN
4-6 OZ
NO
LOAD
TANK
PSI
10-15
LBS
7-11 IN
4-6 OZ
7-11 IN
4-6 OZ
FULL
LOAD
TANK
PSI
10-15
LBS
7-11 IN
4-6 OZ
7-11 IN
4-6 OZ
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