Operational Checkout Procedure
FUEL TRANSFER PUMP
YES: Go to next check.
NO: Be certain fuel filter
is clean. If not, replace
filter and recheck fuel
Open bleed screw (A) on fuel filter and operate hand primer on fuel transfer pump.
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 but resistance decreases as
system pressure increases?
FUEL SYSTEM CHECK
Disconnect fuel return hose from leak-off line.
NO: Fuel supply is
restricted, check for
Connect a hose to leak-off line to route excess fuel into a container.
plugged fuel filters,
plugged fuel tank cap
Start engine and run at fast idle.
vent, restricted lines,
stuck injection pump
Put engine under load by operating a hydraulic function over relief.
overflow valve, or a
Observe fuel flow from leak-off line.
transfer pump. Repair or
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.