Perkins 1106C Genset Systems Operation Testing And Adjusting page 44

44
Testing and Adjusting Section
Illustration 42
10. Connect Tooling (A) and (B) to the low pressure
fuel line. Insert the open end of the tube into a
suitable container.
11. Prime the fuel system to flush fuel through
Tooling (A) and (B). This will minimize the risk
of contaminating the system by introducing dirt
from the service tool. Refer to Operation and
Maintenance Manual, "Fuel System - Prime" for
the correct procedure.
12. Connect the open end of the tube to the inlet
connection (2) of the secondary fuel filter base.
Prime the fuel system. Refer to Operation and
Maintenance Manual, "Fuel System - Prime" for
the correct procedure.
13. Ensure that Tooling (A) and Tooling (B) are
secured and clear of rotating parts.
14. Start the engine. Refer to Operation and
Maintenance Manual for the correct procedure.
Refer to steps 14.a to 14.c for the procedure for
testing the fuel pressure. Refer to steps 14.d to
14.h for the procedure for testing the air in fuel.
Note: The pressure at the fuel transfer pump should
not be measured when the engine is cranked. The
pressure will be low and inconsistent. The engine
should still start even if transfer pressure is zero. The
fuel injection pump will deliver residual fuel in the fuel
injection pump and the secondary fuel filter.
a. Run the engine at a speed of 1000 rpm.
The fuel pressure should be 300 to 550 kPa
(44 to 80 psi).
b. If the fuel pressure is more than 600 kPa
(87 psi), there is a problem with the pressure
regulator for the fuel transfer pump. Replace
the fuel transfer pump. Refer to Disassembly
and Assembly, "Fuel Transfer Pump - Remove"
for the correct procedure.
c. If the pressure is less than 300 kPa (44 psi),
check for restrictions in the low pressure fuel
lines between the fuel transfer pump and the
secondary fuel filter base. Check for excessive
air in the fuel. If no faults are found, replace the
fuel transfer pump. Refer to Disassembly and
Assembly, "Fuel Transfer Pump - Remove" for
the correct procedure.
d. Run the engine high idle.
e. Run the engine for two minutes. There should
be no air in the fuel flow through the sight
tube. Small bubbles that are spaced more
than 2.5 cm (1.0 inch) are acceptable. Do not
manipulate the connections during the test for
the air in fuel.
f. The presence of large bubbles or a continuous
stream of bubbles indicates a leak before the
transfer pump.
g. Investigate potential leaks and rectify any
potential leaks in the low pressure fuel system
between the fuel tank and the inlet at the fuel
transfer pump.
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