TM 1-1520-238-MTF
4-7
(1) When troubleshooting.
(2) After disconnecting engine or fuel lines.
(3) After replacing fuel boost pump, fuel
filter, fuel filter element, oil cooler, ODV
or HMU.
b. With aircraft fuel system pressurized,
advance PWR lever to – LOCKOUT until a
steady stream of fuel, free of air and
preserving oil, is draining from engine
overboard drain. Return PWR lever to –
OFF.
NOTE
After initial installation of a new engine, a
pinkish-colored fuel may drain during va-
por vent or shutdown. This is due to the
presence of residual dye used during fac-
tory fuel system leakage checks. This
fuel coloring is normal under these cir-
cumstances; it is not harmful to the en-
gine fuel system and will not cause op-
erational difficulties; it will disappear as
the engine is operated.
After engine has been depreserved, or
ODV, oil cooler, or HMU have been re-
placed, the first engine start may be
delayed (delayed lightoff). It may also
take longer than normal to reach idle
speed (ground idle). Smoke may be no-
ticed, but visible smoke should disappear
after preservation oil is burned off.
When depreserving engine after instal-
ling in aircraft, motor engine with starter
for 30 seconds.
