Fuel Consumption; Reconfiguring The Fuel System - Generac Power Systems 004742-0 Owner's Manual

1.10.2 ENGINE SPECIFICATIONS
Make..............................................................................Mitsubishi
Displacement ..............................................92 inches
Cylinder Arrangement......................................................4, in-line
Valve Arrangement................................................Overhead Cam
Firing Order........................................................................1-3-4-2
Number of Main Bearings............................................................5
Compression Ratio ..............................................................9 to 1
No. of Teeth on Flywheel ........................................................104
Ignition Timing
at 1800 rpm ..................................................35 degrees BTDC
at 3600 rpm ..................................................43 degrees BTDC
Spark Plug Gap ..................................................0.020-0.025 inch
Recommended Spark Plugs
Champion ....................................................................RN11YC4
Oil Pressure....................................................................30-50 psi
Crankcase Oil Capacity........................4.0 U.S. quarts (3.8 liters)
Recommended Engine Oil........................................SAE 15W-40
Type of Cooling System ..................Pressurized, closed recovery
Cooling Fan ..............................................................Pusher Type
Cooling System Capacity ......................2 U.S. gallons (7.6 liters)
Recommended Coolant ............................Use a 50-50 mixture of

1.11 FUEL CONSUMPTION

25 kW Models
Using Natural Gas ........................................441 cu. ft. per hour
Using LP Gas ..............................175 cubic ft.(4.8 gal.) per hour
20 kW Models
Using Natural Gas ........................................359 cu. ft. per hour
Using LP Gas ............................143 cubic ft. (4.0 gal.) per hour
15 kW Models
Using Natural Gas ........................................277 cu. ft. per hour
Using LP Gas ..............................110 cubic ft.(3.1 gal.) per hour
Fuel pressure for a natural gas set up should be five
inches to 14 inches of water column (0.18 to 0.5
psi) at all load ranges.
Fuel pressure for an LP vapor set up should be 11
inches to 14 inches of water column (0.4 to 0.5
psi) at all load ranges.
Fuel consumption is given at rated maximum con-
tinuous power output when using natural gas
rated at 1000 Btu per cubic foot; or LP gas rated
2520 Btu per cubic foot. Actual fuel consumption
obtained may vary depending on such variables as
applied load, ambient temperature, engine condi-
tions and other environmental factors.
(1.5 liters)
3
ethylene glycol base.
NOTE:
Section 1 — General Information
Liquid-cooled 15 kW, 20 kW and 25 kW Generators
1.12 RECONFIGURING THE FUEL
All models are configured for natural gas from the
factory.
To reconfigure the fuel system from NG to LP vapor,
follow these steps:
1. Turn the main gas supply off.
2. Remove the carburetor fuel hose from the outlet
port (Port 1) of the demand regulator (Figure
1.8).
3. Remove the brass hose fitting from the outlet port
(Port 1) of the demand regulator.
4. Remove pipe plug from Port 2.
5. Install brass hose fitting into Port 2.
6. Install pipe plug into Port 1.
7. Connect carburetor gas hose to brass fitting.
8. Tighten all clamps and plugs.
9. Make sure fuel supply is of the proper pressure
and type for configuration.
10. Reverse the procedure to convert back to natural
gas.
Figure 1.8 — Reconfigure the Fuel System
PLUG
Port 1 is for NG only and Port 2 is for LP vapor
only. No provision for dual fuel has been made.
Serious injury or damage may occur if not con-
!
figured properly. Please consult an Authorized
Service Dealer with any questions.
SYSTEM
NOTE:
Port 1
FUEL HOSE
FUEL HOSE
BRASS HOSE
BRASS HOSE
FITTING
OUT
OUT
PORT 1
PORT 2
HOUSING
PORTS
NG FUEL SYSTEM
NOTE:
DANGER
Port 2
PLUG
FITTING
HOUSING
PORTS
LP FUEL SYSTEM
7