TM 9-2320-272-24-1
3-22. PRIMING FUEL SYSTEM (M939A2)
THIS TASK COVERS:
Priming
INITIAL SETUP:
EQUIPMENT CONDITION
APPLICABLE MODELS
l Parking brake set (TM 9-2302-272-10).
M939A2
l Hood raised and secured (TM 9-2320-272-10).
TOOLS
l Air cleaner hose removed (para. 3-13).
General mechanic's tool kit (Appendix E, Item 1)
GENERAL SAFETY INSTRUCTIONS
MATERIALS/PARTS
All personnel must stand clear during engine
l
cranking operations.
Cleaning cloth (Appendix C, Item 21)
l Use eyeshields and gloves when loosening fuel
REFERENCES (TM)
lines.
TM 9-2320-272-10
TM 9-2320-272-24P
Priming
1.
Loosen adapter (6) and vent screw (7) on fuel pump (5).
NOTE
Perform step 2 until all air is purged from fuel system.
2.
Press plunger (3) on fuel transfer pump (4) until air is purged from fuel system.
3.
Tighten vent screw (7) and adapter (6) on fuel pump (5).
4.
Start engine (TM 9-2320-272-10).
NOTE
If engine fails to start, or runs rough, perform steps 5 through 10.
5.
Loosen fuel line (2) from fuel injector (1).
6.
Place cleaning cloth around fuel line (2) and fuel injector (1).
WARNING
All personnel must stand clear during engine cranking
l
operation. Failure to do so may result in injury to personnel.
Fuel pressure is sufficient to penetrate skin. Wear hand
l
protection and safety goggles at all times when removing
injector tubes. Failure to do so may result in injury to
personnel.
NOTE
Assistant will help with step 7.
7.
Crank engine until all air is vented at fuel injector (1).
8.
Tighten fuel line (2) at fuel injector (1).
9.
Repeat steps 5 through 8 until all fuel injectors (1) are purged free of air.
10.
Stop engine (TM 9-2320-272-10).
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