D:01:08
Fuel,
Emission and Exhaust System
Control
Pressure
1 Restrictor Passage
2 Control Plunger
3 Control Pressure Regulator
Primary Fuel Pressure
Control Pressure
Fuel Return
Fig. 7
CONTROL PRESSURE CIRCUIT
A portion of main line fuel is directed through a
restrictor passage (1) to the top of the control
plunger (2). This pressure circuit is referred to as
the control pressure. The control pressure
generates an opposing force to that originating
from the air flow sensor plate. When the control
pressure
gulator
(3) decreases the control
pressure, the sensor plate will travel further
downward per given air volume, thus increasing
the amount of fuel injected to the engine (rich
mixture). Increasing the control pressure will
reduce the sensor plate travel with the same air
volume reducing the amount of fuel injected to the
engine (lean mixture). Fig. 7
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