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CAUTION
(7) During the "Operational Ground Check" in Chapter 72-00 (which is to be done after all
maintenance is complete), look for fuel leaks at the fuel lines and connections during
engine operation. Identify and correct the cause of any fuel leak. There must not be any
fuel leak when the engine is returned to service.
5. Fuel Injector Replacement
WARNING
DO NOT SMOKE OR HAVE AN OPEN FIRE FLAME OR USE ANY
DEVICE THAT CAN MAKE SPARKS. FLAMES OR SPARKS CAN CAUSE
FUEL IGNITION WHICH CAN CAUSE SERIOUS BURNS, INJURY OR
DEATH.
NOTICE: If this fuel injector replacement procedure is completed with the engine installed in the
airframe, refer to the airframe manufacturer's instructions for shutting off the fuel and
grounding the aircraft.
NOTICE: The fuel injector is not repairable. If damaged, the fuel injector must be replaced.
A. Fuel Injector Removal
(1) Put a fuel collection container under the fuel injector (Figure 8).
(2) Apply an identification label to each fuel line and disconnect the fuel lines attached to the
fuel injector.
(3) Let fuel drain out of the fuel injector and fuel lines into the fuel collection container.
(4) Hold the fuel injector and remove the four nuts, lock washers, and washers from the fuel
injector. Discard the lock washers.
(5) Remove the fuel injector and its gasket. Discard the gasket.
(6) Remove the fuel collection container.
73-10
Page 264
Figure 7
Fuel Line Union Nuts
TO ENSURE CORRECT ENGINE OPERATION AND FLIGHT
SAFETY, THERE MUST NOT BE ANY FUEL LEAK AND ALL
FUEL LINES MUST BE SECURED WITH CLAMPS. IDENTIFY
AND CORRECT THE CAUSE OF ANY FUEL LEAK.
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
March 2020
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