DE08TS Diesel Engines Maintenance of Major Components
Fuel feed pump
1. General descriptions and construction
The P-type injection pump is mounted with K-ADS or
KP type feed pump. These pumps have the same
basic construction and operation, and the general
descriptions of the KP type pump are given below:
The figures show its construction (right figure) and
operation (below figure). The piston in the fuel feed
pump is driven by the push rod and tappet via the
camshaft of injection pump and performs reciprocat-
ing operation to control the suction and delivery of
fuel. When the cam reaches the Bottom Dead Center
as shown in the figure, the fuel is drawn in through the
check valve on the inlet side.
The fuel pressurized as the cam rotates on flows
through the check valve on the outlet side as shown in
(B). If the feeding pressure increases abnormally, the
spring is compressed, resulting in interrupting further
delivery of fuel as shown in (C).
80
Check valve
Check valve
Priming pump
Piston
Inlet
side
Outlet
side
Tappet
Cam shaft
EQM4019I
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