Briggs & Stratton 040661 Installation And Operation Manual page 22

Fuel Installation Plan
Power Loss
Air density decreases at high altitudes, resulting in less
available engine power. Engine power can decrease by
4.8% for each 1000 ft (305 m) above rated altitude of
800 ft (250 m) and by 1.1% for each 10° F (5.6° C) above
77° F (25° C). Adjust the transfer switch of any generator
located in an area affected by high altitudes and drops
in power. See the Automatic Transfer Switch Manual for
details on the process of adjusting for a power decrease.
The Gaseous Fuel System
Fuel Pipe Sizing
An installer commonly uses NFPA 54 and 58 as
resources on this topic. The installer must consider the
specific gravity of gas, compensate for a nominal amount
of restriction from bends and fittings, and refer to federal
and local codes for guidance.
Fuel Conversion
The engine of your home generator system is factory
calibrated and set to operate on natural gas, but it can
also operate on liquefied petroleum vapor.
Units are set to NG at the factory.
To convert to either fuel, follow these steps:
1. Put the key into the lock of the front panel. Lightly
push down on the roof above the lock, and then turn
the key one quarter turn clockwise.
2. Lift the roof to the OPEN position.
3. Push the controller OFF button.
4. Remove the 15-amp fuse in the fuse holder below the
controller.
5. Remove utility power to the generator to de-energize
the battery charger.
6. Disconnect the negative (-) cable at the battery.
7. Remove the end cap controller end.
8. Find the fuel selector valve (A) on top of the fuel
regulator (B). See Figure 10.
Figure 10
9. To set the fuel selector valve:
A. For LP, rotate the lever (C) on the fuel selector
valve until LP is aligned with "OUT" on the fuel
regulator.
Figure 11
22
Installation
A
B
C
Part No. 80106286
Revision C