TM-9-2350-358-BD M109A6 Battlefield Damage Assessment and Repair Download
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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