TM 5-3805-280-24-1
System Operational Checks
FUEL TRANSFER PUMP
YES: Go to next check.
CHECK
NO: Be certain fuel filter
is clean. If not, replace
filter and recheck fuel
supply pump.
T103528 UN04SEP96
T6493AA UN19OCT88
A--Bleed Screw
9010
Open bleed screw (A) on fuel filter and operate hand primer on fuel transfer pump.
10
12
Does fuel come out of bleed screw when hand primer is operated?
Tighten bleed screw and again operate hand primer.
Is resistance felt when hand primer is initially pumped and increase as system
pressure increases?
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FUEL SYSTEM CHECK
Engine OFF.
YES: Go to next check.
Disconnect fuel return hose from leak-off line.
NO: Fuel supply is
restricted, check for
plugged fuel filters,
Connect a hose to leak-off line to route excess fuel into a container.
plugged fuel tank cap
vent, restricted lines,
Start engine and run at fast idle.
stuck injection pump
overflow valve, or a
Put engine under load by operating a hydraulic function over relief.
malfunctioning fuel
transfer pump. Repair or
Observe fuel flow from leak-off line.
replace as necessary.
Does fuel flow from leak-off line with engine at full load?
NOTE: Fuel that flows from leak-off line is excess fuel not required by the engine and
flows back to the fuel tank.
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