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RENR7967
Testing and Adjusting
Section
Fuel System
Fuel System - Inspect
NOTICE
Ensure that all adjustments and repairs that are
carried out to the fuel system are performed by
authorised personnel that have the correct train-
ing.
Before begining ANY work on the fuel system, re-
fer to Operation and Maintenance Manual, "Gen-
eral Hazard Information and High Pressure Fuel
Lines" for safety information.
Refer to Systems Operation, "Cleanliness of Fu-
el System Components" for detailed information
on the standards of cleanliness that must be ob-
served during ALL work on the fuel system.
A problem with the components that transport fuel
to the engine can cause low fuel pressure. This can
decrease engine performance.
1. Check the fuel level in the fuel tank. Ensure that
the vent in the fuel cap is not filled with dirt.
2. Check all fuel lines for fuel leakage. The fuel lines
must be free from restrictions and faulty bends.
Verify that the fuel return line is not collapsed.
3. Install new fuel filters.
4. Cut the old filter open with a suitable filter cutter.
Inspect the filter for excess contamination.
Determine the source of the contamination. Make
the necessary repairs.
5. Operate the hand priming pump (if equipped). If
excessive resistance is felt, check that there is
fuel in the fuel return line to the tank.
Air in Fuel - Test
Ensure that all adjustments and repairs that are
carried out to the fuel system are performed by
i02563346
authorised personnel that have the correct train-
ing.
Before begining ANY work on the fuel system, re-
fer to Operation and Maintenance Manual, "Gen-
eral Hazard Information and High Pressure Fuel
Lines" for safety information.
Refer to Testing and Adjusting Manual, "Clean-
liness of Fuel System Components" for detailed
information on the standards of cleanliness that
must be observed during ALL work on the fuel
system.
This procedure checks for air in the fuel system. This
procedure also assists in finding the source of the air.
1. Examine the fuel system for leaks. Check the fuel
level in the fuel tank. Air can enter the fuel system
on the suction side between the fuel transfer pump
and the fuel tank.
Work carefully around an engine that is running.
Engine parts that are hot, or parts that are moving,
can cause personal injury.
2. Install a suitable fuel flow tube with a visual
sight gauge in the fuel return to tank line. When
possible, install the fuel flow tube in a straight
section of the fuel line that is at least 304.8 mm
(12 inches) long. Do not install the fuel flow tube
near the following devices that create turbulence:
•
Elbows
•
Relief valves
•
Check valves
Observe the fuel flow during engine cranking.
Look for air bubbles in the fuel. If there is no fuel
that is present in the fuel flow tube, prime the
fuel system. Refer to Testing and Adjusting, "Fuel
System - Prime" for more information. If the engine
starts, check for air in the fuel at varying engine
speeds. When possible, operate the engine under
the conditions which have been suspect.
Testing and Adjusting Section
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NOTICE
45
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