• A leak exists in the low-pressure fuel system.
• The fuel filter has been replaced.
• The engine has not been in use for an extended
period.
Hand Fuel Priming Pump
DO NOT loosen the high-pressure fuel lines in order
to purge air from the fuel system. This procedure is
not required.
Use the following procedures in order to remove air
from the fuel system:
1. Ensure that the fuel system is in working order to
remove air from the fuel system. Ensure that the
primary filter is clean and free from dirt.
2. Check that the fuel supply valve (if equipped) is in
the ON position.
Illustration 55 g03352705
3. Unlock priming pump handle (1) by turning handle
counterclockwise.
Note: During priming the hand pressure required to
prime the fuel system will increase.
4. Operate the hand priming pump, the fuel system
will require approximately 200 depression of the
pump before the system will be primed. Lock and
priming handle by securing the handle into the
body of the pump (2). Push handle in and turn
handle clockwise to lock.
Note: Ensure priming handle (1) is locked correctly
into place . If the priming handle is not locked into
place, fuel flow to the fuel system will be obstructed.
5. Operate the engine starter and crank the engine .
After the engine has started, operate the engine at
a low idle for a minimum of 5 minutes. Operating
the engine at a low idle will help ensure that the air
has been removed from the fuel system.
6. If the engine will not start, repeat steps 2 to step 5.
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, “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”.
NOTICE
The low-pressure fuel system can be pressurized for
a time period after the engine has stopped operating.
The operating pressure of the low-pressure fuel sys-
tem can be 500 kPa (73 psi). The secondary fuel fil-
ters should be drained before any maintenance of the
low-pressure fuel system is carried out.
If the engine will not start, refer to Troubleshooting,
“Engine Cranks but will not Start”.
Electric Prime
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.
DO NOT loosen the high-pressure fuel lines in order
to purge air from the fuel system. This procedure is
not required.
1. Ensure that the fuel system is in working order.
Check that the fuel supply valve (if equipped) is in
the ON position.
92
SEBU8731-04
Maintenance Section
Fuel System - Prime
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