Kohler Generator Sets 20--2800 kW - Manual (Page 41)

TP-5700 7/93 29 Section 6 Fuel Systems
6.6 Gasoline Fuel Systems
Due to code restrictions which do not allow storage of
more than one gallon (3.8 L) of gasoline inside a
building, gasoline fuel systems are usually limited to
housed generator sets installed outdoors or portable
trailer-mounted units.
Gasoline will deteriorate if stored for more than six
months, so storage tank size should be kept to the
minimum required by code. Engine fuel pumps usually
will lift fuel up to four feet (1.20 m) or draw it horizontally
up to 20 feet (6.01 m). Auxiliary electric pumps powered
by the engine starting-battery can be connected in
series with the engine pump. See Figure 6-4. Auxiliary
pump pressure should be limited to approximately 5 psi
(34.5 kPa). If the auxiliary pump is located at the fuel
tank,
horizontal and vertical distance limits of
approximately twice those for a lone engine pump are
practical.
Fuel supply lines should be Schedule 40 black iron pipe,
steel tubing, or copper tubing. Galvanized pipe and
fittings are not recommended. Line size should be kept
to the minimum necessary for the required flow.
TP-5700-6
1. Fuel tank
2. Fuel pump
3. Gasoline shutoff
4. Gasoline carburetor
1 2
3 4
Figure 6-4 Gasoline Fuel System
Flexible connections at least six inches (15.3 cm) in
length should be used between stationary piping and
the engine fuel inlet connection.
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling,
storing, and using fuels.
WARNING
Combination natural gas-gasoline fuel systems are
sometimes used with gasoline as a standby fuel to meet
code requirements for on-site fuel supply. Such systems
are not recommended unless the engine will be
operated on gasoline often enough to ensure that fuel
does not deteriorate and the carburetor will not be
disabled by accumulated gum and fuel deposits.
If a fuel storage tank is located above the engine, an
anti-siphon fuel solenoid valve or air bleed hole in the
fuel tank dip tube (near the top of the tube inside the
tank) should be used to prevent siphoning.