Instruction manual

VIII. BUILDING AND INSTALLING THE FUEL TANK ASSEMBLY

Bag Required: 8

Tools or Materials Required:

Modeling knife or razor blade

8.0mm (5/16@) flat wrench

2.25mm diameter (.086@) drill bit (optional)

Small pliers or vice grips (optional)

Forceps (hemostats) (optional)

Premium grade fuel filter(s) (two in all cases except Y.S. engine)

NOTE

: The correct procedure for installing #0405 fuel tank fittings is as follows: Insert fitting from inside the fuel

tank using forceps or fingertips, pull through a snug-fitting hole until the inner flange is flush against the tank

inner surface, install the washer and nut finger tight, insert the shank

of a 2.25mm diameter (.086@) drill bit

into the fitting=s hole (to prevent collapse), lightly grip the nipple with pliers while tightening the nut with an

8.0mm (5/16@) flat wrench. When fully tightened, there will be a Acircle@ of tank material surrounding the

fitting flange which will Araise@ above the tank surface about 0.5mm. This process assures a good seal.

Step 1: Preparing the Fuel Tank

Parts Required: Bag #

1 #0011 M5 flat washers 8

1 #0013 M5 hex nut 8

1 #0401 Fuel pick-up Aclunk@ (brass) 8

1 #0405 Fuel vent fitting (brass) 8

1 #0408 Fuel pick-up fitting 8

1 #0409 90 degree external tank fitting 8

1 #106-52A Pre-drilled fuel tank with cap 8

1 #115-65 Special fuel pick-up tubing (73.0mm) 8

Refer to Drawing #8A

A. Select one #0401 pick-up Aclunk,@ one #0408 pick-up fitting and one #0405 vent fitting. Examine each,

making sure the hole in each is clean and unobstructed. Select the #115-65 special fuel pick-up silicone

tubing and press one end fully onto the nipple on the non-threaded end of the #0408 pick-up fitting. Press the

tubing until it meets the hex surface. Press the other end fully onto the #0401 pick-up Aclunk.@

Special Information Regarding Fuel Pick-up Tubing Materials

: Radical 3-D type flight demands that the fuel

pick-up tubing be very flexible. Your kit includes a special material for this position which eliminates the

need for an auxiliary fuel tank. It is not mandatory but suggested that you use the special tubing if radical 3-D

flight is anticipated. If not, the normal type tubing is acceptable. The general deterioration of the fuel pick-up

tubing within the tank (at a much more rapid pace than outside the tank) is caused by two primary factors:

exhaust gases re-circulated into the tank via the connection of the vent fitting to a fitting on the exhaust system

and the presence of nitro-methane in the fuel. All engines (except Y.S. with its own internal pressure system)

benefit from the typical Aexhaust pressure set-up@ to enhance fuel flow so it=s faults must be accepted. The

nitro-methane content (low 5-10% through high 30%) is also beneficial so this too must be accepted as a

factor contributing to fuel tank maintenance. In basic terms, you must pay frequent attention to the fuel tank if

your goal is to maximize performance and reliability. Should you use any other flexible fuel tubing at the