TM-9-2350-358-BD
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A6
TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT SUPPORT MAINTENANCE
MARCH 1994
TM-9-2350-358-BD - Page 119 of 343
TM 9-2350-358-BD
5-2.
ASSESSMENT PROCEDURE - CONTINUED
Table 5-2.
Fuel System Operation Assessment
ATTEMPT OPERATION
INOPERATIVE:
Fuel Pump(s) (In-Tank).
................................
para 5-5
Fuel Pump, Mechanical.
................................
para 5-6
Fuel Tank .
.....................................................
para 5-7
Fuel Lines and Fittings.
.................................
para 5-9
Fuel Filter(s) .
...............................................
para 5-16
Determine if:
No problem found
Damage can be repaired
Damage cannot be repaired
- Note repair requirements
- Note extent of damage repair
requirements
Go to Table 2-3 Evaluation of
Performance Capability
Operation observation is complete.
Return
to Table 2-2 to continue operation assessment
5-3.
REPAIR PROCEDURE INDEX
PARA
Fuel Pump(s) (In-Tank) Inoperative .
..................................................................................................
5-5
Fuel Pump, Mechanical Inoperative.
..................................................................................................
5-6
Fuel Tank, Leaking .
............................................................................................................................
5-8
Quick Disconnect Leak .
.....................................................................................................................
5-10
Fuel System Seals, Leaking .
..............................................................................................................
5-11
Fittings Leaking .
.................................................................................................................................
5-12
Fuel Line (Low Pressure) Rupture .
....................................................................................................
5-13
Fuel Injector Line Rupture .
.................................................................................................................
5-14
Fuel Filter Clogged or Frozen .
............................................................................................................
5-16
SECTION II.
FUEL PUMPS
5-4.
GENERAL
In-tank (electrical) and mechanical (engine driven) fuel pumps provide fuel at an adequate volume and pressure to the fuel
injectors.
Battle damage to the fuel pumps can degrade or eliminate the howitzer’s capability of movement.
However, the
mechanical fuel pump will draw fuel without the operation of the electrical fuel pumps.
Replacement of a fuel pump is
usually the most expedient method to correct the problem.
Fuel pumps on many combat vehicles are interchangeable with
those on the M109A6 howitzer.
5-5.
FUEL PUMP(S) (IN-TANK), INOPERATIVE
General Information
The in-tank fuel pumps are generally interchangeable between combat vehicles.
The difference is the bracketry used to
mount the pump in the fuel tank.
In-tank electrical fuel pumps from other combat and tactical vehicles can be adapted to
function in the M109A6 howitzer.
If required, the replacement pump can be removed from its bracket and installed in the
bracket from the defective pump.
Replacement of the right in-tank pump requires the removal of the powerpack.
The
following repair will restore the in-tank pump to an operating condition.
5-2
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