Daewoo G424 Gasoline, Service Manual

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G424 Service Manual LPG Fuel System(Low Emission Version) 92
Fuel Control Valve
1. Carburetor AVV port connection
2. Vaporizer secondary vent chamber connection
3. Electrical connectors
4. Balance line connection
The fuel control valve is a three way valve, operated
by a pulse width modulated electronic signal applied to
the electrical connectors (3) by the fuel system ECU.
With no voltage supplied, the vaporizer secondary
vent chamber connection (2) port is connected to the
balance line connection (4) port and in this state the
pressure in the balance (4) pressure signal is
transferred via (2) to the vaporizer and the carburetor
AVV port (1) is blocked. When a signal is provided to
the electrical connectors (3) the valve opens and
connects the vaporizer secondary atmospheric vent
chamber port (2) with the carburetor will provide a
vacuum signal (AVV) which is therefore ‘pulsed’, into
the vaporizer secondary chamber when port (1) and
(2) are connected (i.e when the valve is energized).
Fuel Lock - Off
1. Solenoid coil
2. Fuel inlet connection
3. Fuel outlet connection
4. Electrical connector
The fuel lock-off unit is a direct acting plunger style
unit. Fuel is provided to the fuel inlet connection (2)
and passes into the fitter housing, and through the
fitter. With no electrical signal applied to the electrical
connector (4) the unit is normally closed via spring
pressure inside the coil stem acting on the valve seat.
When power is provided to the electrical connector (4),
the coil (1) is energized and lifts the plunger inside the
coil stem against spring pressure, and allows fuel to
flow to the fuel outlet (3).
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6EN2139
6EV2142