TM 5-1940-322-24
0080 00
FUEL SYSTEM BLEEDING (Contd)
NOTE
Controlled venting is provided at the injection pump, through the
fuel drain manifold. Small amounts of air introduced by changing
the filters or injection pump will be vented automatically.
Manual venting will be required if fuel filter is not filled prior to
installation, injection pump is replaced, high pressure fuel line
connections are loosened or lines replaced, initial engine start up or
start up after an extended period of no engine operation, or fuel
tank has run empty.
LOW PRESSURE FUEL LINES AND FUEL FILTER BLEEDING
1.
Loosen vent screw (1) on filter head (2).
2.
Operate plunger (3) on lift pump (4) until fuel flowing from vent screw (1) is free of air.
3.
Position plunger (3) upward in locked position.
Tighten vent screw (1) to 71 lb-in (8 Nm).
4.
INJECTION PUMP BLEEDING
NOTE
Air/fuel can be pumped from the fuel injection pump locations with the
lift pump plunger.
Have container ready to catch fuel.
1.
Loosen vent screw (7) on fuel injection pump (9).
2.
Operate plunger (3) on lift pump (4) until fuel flowing from vent screw (7) is free of air.
Tighten vent screw (7) 71 lb-in (8 Nm).
3.
4.
Loosen vent screw (8).
5.
Operate plunger (3) on lift pump (4) until fuel flowing from vent screw (8) is free of air.
6.
Tighten vent screw (8) to 71 lb-in (8 Nm).
7.
Position plunger (3) upward in locked position.
WARNING
It is necessary to position the engine circuit switch ON. The engine
may start; ensure all safety precautions for starting the engine are
followed. Failure to comply may result in injury to personnel and/or
damage to equipment.
CAUTION
When using the starter to vent the system, do not engage it for
more than 30 seconds at a time. Wait two minutes between
engagements. Failure to comply may result in damage to
equipment.
NOTE
Air can be vented from the pump through the fuel drain manifold
line by engaging the starter.
8.
Loosen nut (5) on fuel drain manifold line (6).
NOTE
Assistant will help with step 9.
9.
Crank engine to allow air to vent from line (TM 5-1940-322-10).
Tighten nut (5) on fuel drain manifold line (6) to 22 lb-ft (30 Nm) when fuel flowing from nut is free of air.
10.
11.
Start engine and check for leaks (TM 5-1940-322-10).
12.
Close engine hatches (TM 5-1940-322-10).
0080 00-2
