TM-9-2350-274-BD M109 Battlefield Damage Assessment and Repair Download
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TM 9-2350-274-BD FUEL SUPPLY SYSTEM SECTION 111. Fuel Pumps 4-6. General (M110/M578 only). Engine will not start, no fuel to injector pump. The in-tank fuel pumps are generally interchangeable between combat vehicles. The difference is in the bracketry used to mount the pump in the fuel tanks. The electrical pump unit can be removed and used on the brackets to tit M109/M110/M578 vehicle, 4-7. FUEL PUMP FAILURE General Information: As long as the engine driven fuel pump is operational and fuel tanks are at least half full, none of the electric fuel pumps are crucial to the operation of the vehicle. The following battle damage solution substitutes the air box heater fuel pump for a damaged engine-driven fuel pump. Some vehicles of the M109/M110 M578 family do not have a primary fuel filter drain hose. In this case, a length of rubber hose approximately 5 feet long will be required to act as the fuel line between the air box heater fuel pump and the secondary fuel filter. Limitations: ● None Personnel/Time Required: ● 1-2 soldiers ● 30-45 minutes Materials/Tools: ● Hose ● Screwdriver NOTE Must purge fuel system thoroughly. Procedural Steps: a. Secondary: 1. Gain access to engine compartment and locate secondary fuel filter (item 1) (110/578). 2. Remove screw (item 2) and hose restraining clamp (item 3). 3. Loosen nut (item 7) and disconnect engine driven fuel pump-to-secondary fuel filter tube (item 9). 4. Remove elbow (item 8) from secondary fuel filter inlet (item 10). Change 3 4-5