TM-9-2350-274-BD
M109/M110/M578 VEHICLES HOWITZER, MEDIUM, SELF-PROPELLED FULL-TRACKED
TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1984
TM-9-2350-274-BD - Page 76 of 219
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
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