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LP Engine G430 (3.0L)
LP Fuel System (Low Emission Version)
opens in response to the negative pressure signal
generated by the variable venturi air/fuel mixer.
Pressure regulators equipped with a blue
secondary spring (8) require negative 1.5 inches
(38.10mm) of water column to begin opening the
secondary valve (7). The amount of fuel flowing
from the regulator is directly related to the strength
of the negative pressure signal generated by the
air/fuel mixer. The strength of the negative pressure
signal developed by the air/fuel mixer is directly
related to the amount of air flowing through the
air/fuel mixer into the engine, therefore, the larger
the quantity of air flowing into the engine, the larger
the amount of fuel flowing to the air/fuel mixer. This
design in conjunction with the profile of the gas
valve in the air/fuel mixer allows for a consistent
air/fuel mixture over the complete operating range
of the engine.
Variable Venturi Air/Fuel Mixer
In the LPG mixers the fuel discharge jet is normally
closed. A vacuum signal from the engine cranking
or running is required to draw fuel from the
discharge jet. This is the third of three safety locks
incorporated into the DAEWOO LP Engine System.
If the engine stops or is turned off fuel flow
automatically stops. When the mixer receives the
desired vacuum signal from the engine the air valve
lifts in proportion to the amount of air being draw
into the engine. The lifting of the air valve allows a
metered amount of propane vapor to be drawn from
the regulator and blended with the incoming air at
the proper ratio. The air and fuel mixture then
travels through the intake manifold and into the
engine cylinders where it is compressed, ignited
and burned.
