TM 5-3895-382-24
Priming the System
After changing the fuel filters, prime (purge) the fuel
system to remove air bubbles from the system.
DO NOT REMOVE the plug in the fuel filter base (for the
fuel pressure sending unit, if equipped) to release air
from the fuel system while priming. Periodic removal of
the plug will result in increased wear of the threads in the
fuel filter base and lead to fuel leakage.
NOTE: If priming pump lever cannot be operated,
the drive cam of fuel lift pump is at the point
of maximum cam lift. Therefore the
crankshaft must be turned one revolution.
Ensure that the manual stop control is in the
RUN position or electrical stop control
(ignition key) is in "R" position.
1.
Operate the priming pump plunger located on fuel
lift pump for approximately two minutes or until a
resistance is felt.
NOTICE
Do not crank the engine for more than 30 seconds.
Allow the starter to cool for two minutes before
cranking again.
2.
Open the fuel valve and start the engine. It may
be necessary to prime the fuel system if the
engine does not start. Inspect for fuel leaks.
Crank the engine. If the engine will not start, or
once started continues to misfire or smoke, further
priming is necessary.
3.
If the engine starts, but runs rough, continue
running the engine at low idle until the engine runs
smoothly.
4.
If the engine will not start, loosen the fuel line nuts
at two of the nozzles to help purge fuel lines of air
before air bubbles enter injection nozzles.
5.
Crank the engine again until the fuel flows free of
air bubbles. Be sure to tighten each fuel line nut.
Tighten the union nuts to 18 4.5 Nm (13.3 3.3
lb ft). If the engine will start, then continue to run
the engine until fuel flows free without pockets of
air in the fuel lines.
Maintenance Section
1-79
Every 250 Service Hours or 3 Months
