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 TM 55-1905-221-14-2
5-18. FUEL INJECTOR (Continued).
LOCATION/ ITEM
ACTION
REMARKS
TESTING (Cont)
h. Check fixture gage and record
the injector valve opening (pop)
pressure, indicated when the
injector sprays fuel.
i. The pop pressure should be 450
If pop pressure
to 850 pounds per square inch
does not fall
(3,103 to 5,860 kpa).
within the 450
to 850 psi
(3,103 to 5,860
kpa) range,
repair or
replace
injector.
11. Valve
a. Operate the pump handle to bring
Holding
the fuel injector pressure up
Pressure
to a point just below the injec-
Tester
tor pop pressure (450 psi)
(3,103 kpa).
b. 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 (3,103 kpa to 1,724 kpa)
should not be less than 40
seconds.
c. If the injector pressure drops
from 450 pounds per square inch
to 250 pounds per square inch
(3,103 kpa to 1,724 kpa) in less
than 40 seconds, perform the
following:
Wear protective eye goggles when using compressed air to avoid eye injury.
1. Thoroughly dry the injector
with compressed air.
5-411
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