Operation
5583−1/A1
Winterthur Gas & Diesel Ltd.
1/ 2
Fuel Pump Actuator
1. General
Each fuel pump (1, Fig. 1) has an electrically-operated actuator (2). The regulating
linkage connects the actuator (2) to the fuel pump (1). The lever (6) moves the
connecting element (5), which moves the toothed rack (4) to the applicable position to
control the fuel flow through the fuel pump (1).
2. Function
The WECS−9520 controls each fuel pump actuator. The fuel pump actuator controls
the fuel quantity and keeps the necessary pressure in the fuel rail.
During operation, the actuators move at the same time i.e. the control positions and
the fuel quantity that flows through the fuel pumps are the same.
If a pump plunger does not move, which blocks the toothed rack (4), electrical power
to the related actuator must not be disconnected (there is overload protection).
If a fuel pump actuator becomes defective, its lever (6) stays in position or turns
slowly to the zero supply position. The other actuators get control of the fuel quantity
supply (see also 0515−1, paragraph 2 Defective actuator).
Note: In the lower load range (at lower fuel consumption) the fuel pressure
control valve 3.06 controls the fuel pressure regulating function. This is
because the fuel pump actuators cannot decrease the fuel quantity
supply (see also 5562−1 Fuel Pressure Control Valve 3.06).
2017−08
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