Fuel Factors - Briggs & Stratton 40375 Operator's Manual

Fuel Factors

WARNING Propane and Natural Gas are extremely
flammable and explosive, which could
cause burns, fire or explosion resulting in
death or serious injury.
The residential generator is equipped with
an automatic safety gas "fuel shut-off" valve.
DO NOT operate the equipment if the "fuel shut-off" valve
is missing or inoperative.
An important consideration affecting the entire installation
is the type of fuel used by your generator. The system was
factory tested and adjusted using either natural gas or liquid
propane (LP vapor). For proper engine function, factors
that are inherent to each of these fuels, your location and
the duration of possible utility interruptions are important
considerations in the following fuel guidelines:
particulate material. Using fuels outside the
following recommended values may cause
performance problems.
grade HD5 propane with a minimum fuel energy of
2500 BTUs/ft 3 with maximum propylene content of
5% and butane and heavier gas content of 2.5% and
minimum propane content of 90%.
Natural gas rating will depend on specific fuel but typical
derates are between 10 to 20% off the LP gas rating.
Natural gas or LP engines are certified to operate on natural
or liquid propane gas. The emissions control system for this
engine is EM (Engine Modifications).
Power Decrease at High Altitude or High Temperature
Air density is less at high altitudes, resulting in less available
engine power. Specifically, engine power will decrease 3.5%
for each 1,000 feet (300 meters) above sea level and 1% for
each 10° F (5.6°C) above 77°F (25°C). Make sure you and
your installer consider these factors when determining total
generator load.
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