3. If fuel quality is still suspected as a possible cause
to problems regarding engine performance,
disconnect the fuel inlet line. Temporarily operate
the engine from a separate source of fuel that is
known to be good. This will determine if the
problem is caused by fuel quality. If fuel quality is
determined to be the problem, drain the fuel
system and replace the fuel filters. Engine
performance can be affected by the following
characteristics:
• Cetane number of the fuel
• Viscosity of the fuel
• Lubricity of the fuel
• Air in the fuel
• Other fuel characteristics
Refer to Operation and Maintenance Manual,
“Fuel Recommendations” for more information on
the cetane number of the fuel.
i05806374
Fuel System - Prime
Note: Refer to Systems Operation, Testing, and
Adjusting,
“Cleanliness of Fuel System
Components” for detailed information on the
standards of cleanliness that must be observed
during ALL work on the fuel system.
Ensure that all adjustments and repairs are
performed by authorized personnel that have had the
correct training.
NOTICE
Do not crank the engine continuously for more than
30 seconds. Allow the starting motor to cool for two
minutes before cranking the engine again.
If air enters the fuel system, the air must be purged
from the fuel system before the engine can be
started. Air can enter the fuel system when the
following events occur:
• The fuel tank is empty or the fuel tank has been
partially drained.
• The low-pressure fuel lines are disconnected.
• A leak exists in the low-pressure fuel system.
• The fuel filter has been replaced.
Use the following procedure in order to remove air
from the fuel system:
1. Ensure that the fuel system is in working order.
Check that the fuel supply valve (if equipped) is in
the “ON” position.
2. Turn the keyswitch to the “RUN” position.
3. The keyswitch will allow the electric priming pump
to operate. Operate the electric priming pump for 2
minutes.
4. Turn the keyswitch to the “OFF” position. The fuel
system should now be primed and the engine
should be able to start.
5. Operate the engine starting motor and crank the
engine. After the engine has started, operate the
engine at low idle for a minimum of 5 minutes.
Ensure that the fuel system is free from leaks.
Note: Operating the engine for this period will help
ensure that the fuel system is free of air. DO NOT
loosen the high-pressure fuel lines in order to
purge air from the fuel system. This procedure is
not required.
After the engine has stopped, you must wait for 10
minutes in order to allow the fuel pressure to be
purged from the high-pressure fuel lines before any
service or repair is performed on the engine fuel
lines. The 10 minute wait will also allow static charge
to dissipate from the low-pressure fuel system. If
necessary, perform minor adjustments. Repair any
leaks from the low-pressure fuel system and from the
cooling, lubrication, or air systems. Replace any high-
pressure fuel line that has leaked. Refer to
Disassembly and Assembly Manual, “Fuel Injection
Lines - Install”.
If you inspect the engine in operation, always use the
proper inspection procedure in order to avoid a fluid
penetration hazard. Refer to Operation and
Maintenance Manual, “General hazard Information”.
If the engine will not start, refer to Troubleshooting,
“Engine Cranks but will not Start”.
UENR4490-01 85
Fuel System
This document has been printed from SPI2. NOT FOR RESALE
To Next Page
Loading...
