Generac 86640 - Manual (Page 61)

Section 5.1- GENERAL INFORMATION
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Fuel Recommendations
Any high quality LEADED or UNLEADED regular grade
?
iasoline having a minimum posted octane number of 86
research octane number 90) is satisfactory for use with RV
and IM generators.
Use of any gasoline containing alcohol (either methanol
or ethanol) Is NOT RECOMMENDED. Gasolines containing
alcohol tend to absorb moisture from the air. Such absorption
causes the water and alcohol to separate from the gasoline
in the fuel tank. The adverse affects of alcohol increase in
severity with methyl alcohol (methanol). In addition, the ad­
verse affects worsen with increasing alcohol content. Use of
gasoline containing alcohol may result in one or more of the
following:
D
Corrosion of metal parts.
CD Deterioration of elastomer and plastic parts,
n Fuel permeation through flexible fuel lines.
D Wear and damage of internal engine parts.
D
Starting and operating difficulties.
If the use of gasoline containing alcohol cannot be
avoided, do not store the gasoiine in fuel tank for long periods
of time. Long periods of fuel storage create unique problems.
Fuel System Components
Major gasoline fuel system components include (at a fuel
pump, (b) the carburetor, and (c) interconnecting fuel lines.
See Figure 1.
When the engine is cranked and started, the 12 volts DC
electric fuel pump is turned ON. At the same time, a solenoid
actuated fuel shutoff valve on the carburetor is opened to
allow fuel flow to the caiburetor.
The carburetor mounts an automatic electric choke
which closes the carburetor choke valve while the engine is
being cranked.
Carburetor throttle valve setting is established by the
action of a constant speed governor. Most generator models
utilize a mechanical, flyweight type governor. Some models,
however, may be equipped with an electronic governor.
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