18
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4) Push one 4mm x 28mm prebent nylon vent
tube through the nylon backplate and through the rub-
ber stopper until it protrudes 3/8” from the front of
the stopper.
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5) Using a modeling knife, remove part of the
second nylon vent tube as shown below. This will be
the fill tube. Push it through the nylon backplate and
through the rubber stopper until it protrudes 3/8” from
the front of the stopper. It is used in conjunction with
the fuel filler that will be installed later. Orientate the
tubes as shown. See figure # 13 below.
Figure # 13
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6) Slide the nylon fuel cap over the three tubes
at the front of the stopper. Insert the 3mm x 18mm
self tapping screw into the center hole in the cap. Push
the screw through the stopper and into the nylon back-
plate. Begin to tighten the screw, but do not com-
pletely tighten it at this time.
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7) Slide the silicon fuel tubing, with the
weighted pickup attached, onto the rear portion of the
nylon pickup tube. See photo # 35 below.
STOPPER INSTALLATION
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8) Press fit the stopper assembly into the tank
opening. The stopper should be rotated so the nylon
vent tube is pointing straight up towards the top of
the tank. See photo # 36 at top right.
Photo # 35
Photo # 36
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9) With the stopper assembly in place, the
weighted pickup should be about 3/8” from the rear
of the tank and move freely within the tank. Adjust
the length of the tube accordingly.
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10) When satisfied with the alignment of the
stopper assembly, tighten the 3mm x 18mm self tap-
ping screw until the stopper expands and seals the
tank opening. Do not overtighten the screw as this
could cause the tank to split.
For added security you may wish to apply a thin
bead of silicon sealer around the fuel cap where
it seals around the front of the tank. Make sure not to
get any sealer in the nylon fuel tubes.
FUEL TANK INSTALLATION
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11) Install three lengths of silicon fuel tubing
onto the vent, fuel pickup and fuel filler tubes at the
front of the tank. Slide the fuel tank into position in
the tank compartment while feeding the fuel lines out
the predrilled hole in the firewall. The tank should
be installed so that the top of the tank faces the top of
the fuselage and the stopper assembly should engage
the predrilled hole in the firewall.
Do not permanently secure the tank in place until
after balancing the airplane. It may be neces-
sary to mount the receiver or the battery pack inside
the tank compartment to help balance the airplane.
After you have completed balancing, secure the tank
in position using a couple of dabs of silicon sealer
between the tank and the forward bulkhead. We also
recommend sealing the predrilled hole in the firewall
with silicon sealer to prevent exhaust residue from
entering the fuselage.
Nylon
Backplate
Vent
Tube
Pickup
Tube
Fill
Tube
(Drawing is Full Size)
Pickup
Silicon
Tube
Cap
Rubber
Stopper
Backplate
Fill
Tube
Vent
Tube
Machine
Screw
Top
Vent
Tube
Fill
Tube
Pickup
Tube