Perkins Phaser Series - General Description

20B FUEL SYSTEM
General description
Caution: It is very important that dirt does not enter
the fuel system. Before a connection is
disconnected, clean thoroughly the area around the
connection. After the component has been
disconnected, fit a suitable cover to all open
connections.
The Bosch MW in-line fuel injection pump has a
mechanical governor (A2) fitted to the rear of the
pump to control engine speed. On top of the
governor housing is a boost control (A1). The boost
control is a device which is affected by boost
pressure (from the turbocharger) and reduces the
maximum fuel delivery at lower engine speeds to
match the reduced air supply to the cylinders.
The "low spring" atomisers receive high-pressure
fuel from the fuel injection pump and inject this fuel
into the combustion chamber of the piston as a
very fine spray. The atomisers are set in the
factory, but must be checked in accordance with
the preventive maintenance schedules. The
pressure at which atomisers operate can be
adjusted by a shim fitted above the spring.
The fuel injection equipment must be checked and
adjusted by personnel who have had the correct
training.
The plunger type fuel lift pump (A4) can either be
on the side of the fuel injection pump, or on the
right side of the cylinder block. When the lift pump
is fitted to the cylinder block, an adaptor is fitted
between the pump and the cylinder block. The fuel
lift pump is driven by an eccentric on the camshaft
of the fuel injection pump, or by an eccentric on the
engine camshaft. The fuel lift pump is fitted with a
priming pump (A3).
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PA201
20B.02 Perkins Phaser/1000 Series, April 1995