Advertisement
Engine - Engine and crankcase
6
NDIL14TR00926FA
Fuel system
The diesel fuel system consists of fuel tank, lift pump, fuel filters, mico rotary type fuel injection pump, fuel injectors,
and interconnecting tubes and lines.
The fuel injection pump is pressure fed from the lift pump. Fuel flows from the fuel tank to the sediment separator
(incorporated in lift pump), through the lift pump, then through the primary fuel filter and then to secondary fuel filter.
from the filter the fuel passes to the fuel injection pump to supply fuel at high pressure to each injector and also
provides extra fuel which lubricates and cools the injection pump.
This extra fuel is recirculated to the fuel tank, by means of the injector leak-off line.
Also excess fuel that leaks past the needle value of the injectors in directed back to the fuel tank, by means of the
injection leaf off-line.
Fuel shut-off (Injection pump)
Fuel injection pump is equipped with an electrically operated fuel shut off solenoid is energized by operation of the
ignition switch mounted in the instrument panel.
With the ignition switched "Off" a spring loaded plunger in the solenoid (held in position by the spring tension), prevents
fuel flowing into the pump from the main fuel feed port. With the ignition switched "on" the magnetized plunger is
energized by an internal coil and is drawn up into the body of the solenoid. Fuel is then allowed to flow through the
open port into the pump.
Lift pump
A diaphragm type fuel lift pump is located between tank and primary fuel filter. The pump draws fuel from the tank via
the sediments (incorporated in lift pump) and passes fuel under pressure to the primary and secondary fuel filter and
onto the fuel injection pump.
47899733 23/06/2015
10.1 [10.001] / 13
Hide quick links:
Advertisement
