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IO-390-D Series Engine Installation and Operation Manual
5. Connect the fuel supply line to the fuel pump inlet. Torque the connections per the aircraft
manufacturer's instructions.
6. Required guidelines for making fuel line connections:
A. Make sure the fuel line is not crimped or kinked, there are no cracks at solder joints, and
the fuel line is in compliance with Figure 1 for the minimum acceptable dimension for a
bend in the fuel line.
NOTICE: Refer to Chapter 73-10 in the IO-390-D Series Engine Maintenance Manual
for suggested routing and configuration arrangement diagrams for fuel lines on
this engine. The fuel line configuration diagram is conceptual and for reference
only. Fuel line routing on your engine could have slightly different
configurations. Fuel lines must be examined every 100 hours per the IO-390-D
Series Engine Maintenance Manual.
B. Make sure that the fuel lines are held in place with the necessary cushioned clamps and
hardware. Make sure the clamps are tightly attached to support the fuel line and to
prevent movement from vibration or motion frequencies. Do NOT use plastic tie straps in
place of cushioned clamps.
WARNING
C. Do not let fuel lines touch the
engine or aircraft baffle
hardware. There must be a
minimum clearance of 3/16 in.
(4.76 mm) between a fuel line
and any engine or aircraft
surface.
D. Torque the fuel line
union nut (Figure 2)
between 35 to 50 in.-
lb. (4 to 6 Nm).
CAUTION
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.
© 2020 Avco Corporation. All Rights Reserved
March 2020
DO NOT ROUTE FUEL LINES CLOSE TO HEAT SOURCES. HEAT
CAN DAMAGE THE FUEL LINE AND CAUSE A FUEL LEAK
WHICH COULD LEAD TO CATASTROPHIC ENGINE FAILURE.
Figure 1
Minimum Acceptable Dimension
for a Bend in a Fuel Line
Figure 2
Fuel Line Union Nuts
Engine Installation
Page 19
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