Fuel Pump Replacement - Lycoming IO-390-D Series Maintenance Manual

IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
(1) Install the fuel manifold and the bracket (Figure 1) on the fuel injector with the hardware
fasteners. Torque the bolts and screws on the bracket to 25 to 30 in.-lbs (2 to 3 Nm).
(2) Safety wire/cable the bolts and screws on the bracket as shown in Figures 12A to 12D.
(3) Attach all fuel fittings with fuel line to the corresponding identified ports on the fuel
manifold.
(4) Torque the fuel line fittings in accordance with the latest revision of the Service Table of
Limits - SSP-1776.
(5) 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.

9. Fuel Pump 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 pump 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.
The fuel pump is not repairable. If the fuel pump is damaged or non-operational, replace
the fuel pump with a serviceable unit.
A. Fuel Pump Removal
(1) Put a fuel collection container
under the fuel line connections at
the AC-type fuel pump (Figure
13).
(2) Apply a label and disconnect the
fuel lines to the fuel pump.
(3) Remove the two screws and
washers from the fuel pump.
(4) Remove the fuel pump and gasket
from the accessory housing.
Discard the gasket.
(5) Remove the fuel collection
container.
B. Fuel Pump Installation
(1) Turn the crankshaft to move the fuel pump plunger to the highest position.
(2) Apply Lubriko M-6 grease to the shaft of the AC-type fuel pump.
(3) Apply Loctite
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March 2020
®
564 or equivalent to the fuel pump screws.
Figure 13
AC-Type Fuel Pump
73-10
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