TM 9-2350-274-BD
FUEL SUPPLY SYSTEM
SECTION V. Fuel Filters
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4-12. General.
The M109/M110/M578 series has two fuel filters; the primary fuel filter is accessible from the driver’s
compartment and the secondary is accessible through the transmission access doors/deck covers. The
M109A2 primary fuel filters are accessible thru the transmission access doors. The filters must be checked
for dirt or water to keep the fuel uncontaminated and flowing freely. Filters do, however, become clogged
with dirt and the container collects water. In cold weather the water can freeze and stop the flow of fuel.
Only as a last resort should the filters be by-passed and allow unfiltered fuel to reach the engine.
4-13. FUEL FILTER CLOGGED OR FROZEN
General Information:
Engine will not start because the fuel filters frozen or clogged.
Dirty fuel will harm the injectors and
must not be unfiltered for long periods.
Limitations:
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Unfiltered fuel and no manifold preheater operation.
Personnel/Time Required:
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1 soldier
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30 minutes
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Materials/Tools:
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4-12
Change 1