Install The Fuel Tank - GREAT PLANES Piper J-3 Cub Instruction Manual

❏ 9. Slip the Cowl over the front of the fuse. Cut a hole in
the cowl just large enough to accommodate the engine.
After the cowl is mounted, you can enlarge the hole to allow
some clearance for a more finished appearance.
❏ 10. Align the front of the cowl 1/8" [3mm] behind the drive
washer of the engine and tape it to the fuselage.
❏ 11. Drill a 5/64" [2mm] hole through the cowl into the
fuselage. Screw a #4 x 1/2" Sheet Metal Screw through the
cowl just far enough into the fuselage to temporarily hold
that part of the cowl in place. One at a time, drill a hole and
insert a screw into the cowl the same way. Depending on
the engine, you may use either four or five screws to secure
the cowl.
❏ 12. Remove the cowl. Roughen the inside of the cowl
around the screw holes with 80-grit sandpaper. Cut four 1"
square pieces of glass cloth and glue them to the inside of
the cowl over the mounting holes with 30-minute epoxy as
shown in the photo. Set the cowl aside while the epoxy
cures. Use a small amount of epoxy to fuelproof the cowl
mounting blocks.

Install the Fuel Tank

❏ 1. Cut the clear pick-up tube included with this kit to a
length of 3-3/16" [81mm]. Assemble the fuel tank as shown
in the sketch using the 90-degree nipple. After you
assemble the tank hold it up to the light and make sure the
clunk does not contact the rear of the tank. If necessary,
disassemble the tank and shorten the pick-up tube.
❏ 2. Wrap the tank with 1/4" [6mm] foam rubber secured
with a couple of rubber bands.
❏ 3. Remove the engine mount. Drill 1/4" [6mm] holes
through the firewall for your fuel lines. Make sure to drill the
holes where they will not interfere with the engine mount.
❏ 4. Fit approximately 12" to 14" [300mm to 360mm] of fuel
line on the pick-up and vent nipples of your fuel tank. Pull the
fuel lines through the holes you drilled in the firewall as you
install your tank. Be certain you do not kink the fuel lines.
❏ 5. Mount the muffler to your engine. Trim the cowl where
necessary so it does not interfere with the muffler, allowing
an approximate 1/4" [6mm] clearance all the way around.
Attach the fuel lines from the fuel tank to the engine, making
sure the fuel and pressure lines are correctly attached.
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