98
SEBU8603-01
Maintenance Section
Fuel System - Prime
i03906114
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
fi
lter has been replaced.
Use the following procedures 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.
The ECM will stop the pump after 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 starter 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. 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
fl
uid 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”.
i04224203
Fuel System Primary Filter
(Water Separator) Element -
Replace
Fuel leaked or spilled onto hot surfaces or elec-
trical components can cause a
fi
re. To help pre-
vent possible injury, turn the start switch off when
changing fuel
fi
lters or water separator elements.
Clean up fuel spills immediately.
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.
NOTICE
Ensure that the engine is stopped before any servicing
or repair is performed.
Remove the Element
1.
Turn the fuel supply valve (if equipped) to the OFF
position before performing this maintenance.