Daewoo D1146 Maintenance Manual page 120

D1146/D1146TI/DE08TIS
MAINTENANCE MANUAL
4.3.4. 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 reciprocating 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).
This feed pump is mounted with a priming pump designed to permit manual feeding
of fuel from the fuel tank with the injection pump mounted in the engine. During the
manual feeding operation, air must be bled from the fuel lines.
When using the priming pump, fix it securely to prevent the possible entry of
moisture or other foreign substances in the inside of feed pump.
115
Printed in Jan. 2001 PS-MMA0415-E1A