Dual Fuel System - Daewoo G424 Gasoline Service Manual

DUAL FUEL SYSTEM

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Dual Fuel Basic Schematic
(1) Gasoline inlet line (from gasoline tank). (2) Mechanical fuel pump. (3) LP mixer. (4) Balance hose. (5) LP electric fuelock. (6) LP
fuel line. (7) Gasoline electric fuelock. (8) Converter. (9) Selector switch. (10) Carburetor. (11) Elbow. (12) LP fuel line. (13) LP fuel
filter. (14) LP fuel inlet line (from LP tank).
The dual fuel system is a combination of the gasoline
and the liquid petroleum fuel systems. This system
allows the operator to run the engine on gasoline or
liquid petroleum fuel.
The basic components of the dual fuel system are the
LP and gasoline fuel tanks, mechanical fuel pump (2),
selector switch (9), gasoline carburetor (10), LP mixer
(3), converter (8), LP fuelock (5), LP fuel filter (13),
gasoline fuelock (7) and the connecting fuel lines.
When selector switch (9) is in the gasoline position,
gasoline fuelock (7) is open. Gasoline is drawn through
line (1), the fuel filter and fuel pump (2), fuelock (7) and
into the carburetor, where the fuel is mixed with air at the
correct ratio. The air and fuel mixture fuel then goes to
the inlet manifold and is changed to a vapor. It then goes
to the combustion chamber of each cylinder.
NOTE: Refer to the topics Gasoline Fuel System and
Liquid Petroleum Fuel System for the operation of the
components not explained here.
To change from gasoline to LP fuel, selector switch (9)
should first be put in the OFF position. This is done to
allow the gasoline in the line and the carburetor to be
used before LP fuel is started. When selector switch (9)
is turned OFF or to the LP position, power to gasoline
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fuelock (7) is stopped, which closes fuelock (7) and
shuts off the gasoline supply to the carburetor.
When selector switch (9) is turned to the LP position, LP
fuelock (5) opens and LP fuel flows through line (14),
filter (13) and to converter (8). The converter changes
the fuel to a vapor. This vapor flows through line (12) to
mixer (3). The mixer sends the vapor through elbow (11)
to the gasoline carburetor, which now acts as a throttle
plate. From the carburetor, the vapor goes through the
inlet manifold to the combustion chamber of each
cylinder.
Balance hose (4) between the atmospheric opening in
the converter and the mixer keeps the correct air and
fuel mixture in the mixer when there is some restriction
in the air cleaner.
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Dual Fuel System
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