Hangar 9 Piper Pawnee 40 ARF - Manual (Page 39)

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 Step 12
Attach the muffler to your engine following the instructions
provided with your particular engine.
 Step 13
Look carefully at the fuel tank to determine which tubes
are for the carburetor and vent. Also check the direction
of the vent line inside the fuel tank. The vent will face the
top of the fuselage when the fuel tank is installed. Use the
drawings below as a reference for the fuel lines.
Clunk
Vent line
Top View
Side View
Vent line (faces top of fuselage)
To Muffler
To Carburetor
 Step 14
Slide the tank into the fuselage, making sure the vent line
faces toward the top of the fuselage.
 Step 15
Install a brace and foam padding around the fuel tank
to keep it in position inside the fuselage and protect it
from vibration.
Section 7: 4-Stroke Installation