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 TM 55-1905-221-14-4
6-31. FUEL INJECTORS (Continued).
LOCATION/ITEM
ACTION
REMARKS
TESTING (Cont)
If the pop pressured does
not fall within the above
range, repair or replace
the injector.
c. Valve holding pressure test.
(1) Operate the pump handle
to bring the fuel injector
pressure up to a point
just below the injector
pop pressure (450 psi).
(2) Close the fuel shutoff
valve and note the
pressure drop. The time
for a pressure drop from
450 pounds per square
inch to 250 pounds per
square inch should not
be less than 40 seconds.
(3) If the injector pressure
drops from 450 pounds
per square inch to 250
pounds per square inch
in less than 40 seconds,
perform the following:
WARNING
Wear safety goggles when using compressed air to avoid eye injury.
(a) Thoroughly dry the
injector with compressed
air. Open the test
fixture fuel valve and
operate the pump handle
to maintain the testing
pressure of 450 pounds
per square inch.
6-552
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