With the simple two-line fuel system shown in this manual, these
two parts create a very neat and efficient fueling system. The SIG
Fueling Valve Bracket allows the fuel valve to be mounted to the
firewall. This eliminates the need to mount it to the cowl where it
could damage the paint or fiberglass by repeated use. As shown,
we located our fuel valve on the left side of the cowl, just behind
the center of the black trim stripe on the cowl.
a) First, mount the SIG fueling valve bracket to the firewall
using the provided sheet metal screws. Next, mount the Kwik-Fill
valve to the mounting bracket, tightening it firmly in place.
Lay a piece of 1/16” wide trim tape over the exact center of the
valve, in a straight line back along the fuselage to a distance of
about 8” or so.
This tape will assist in locating the required
opening in the cowl for the fueling valve.
b) Install the cowl back onto the fuselage using the four
mounting screws. At the exact rear edge of the cowl in side view,
at the black trim stripe, lay another piece of 1/16” trim tape
vertically, matching the rear edge of the cowl. Remove the cowl
from the fuselage. From the forward edge of the vertical piece of
trim tape, measure the distance to the center of the fueling valve
and note this measurement on paper (for reference, our
(.093) bit to drill a hole through the cowl at the dimple mark just
made by the sharpened wire. Remove the cowl and remove the
needle valve and wire from the engine. Remove and discard the
sharpened piece of music wire from the needle valve.
Cut a fresh 4” piece of 5/64” dia. MW and deburr the ends. Install
one end of this new wire piece into the needle valve and tighten the
setscrew to hold it. Reinstall the cowl back onto the fuselage using
the four mounting screws. From the front of the cowl insert the
needle valve with the wire in place, wire end first. Guide the wire
end through the 3/32” hole in the cowl. Hold the wire end with your
fingers. Now locate the carburetor opening for the needle valve
and thread the needle valve fully back into the carburetor.
At the outside of the cowl, use a fine tip marker to mark the wire
about 1/8” or so away from the cowl itself. Once again, unthread
the needle valve and remove it and the wire from the cowl. Use a
heavy set of pliers to bend the wire 90
O
at the mark just made. Use
a carbide cut-off wheel to trim the bent end of the wire to a length
of about 1/2” or so. You should now have accurately located and
usable needle valve extension.
The only other thing that we would suggest is removing the
extension from the needle valve and filing or grinding a small "flat"
in its surface where the needle valve setscrew contacts it. This
allows the setscrew to hold the extension firmly in place without
loosening. Remove the cowl from the fuselage and set aside the
needle valve and extension for later final assembly.
❑
5) The next item to address is the ability to fuel and defuel the
tank. We used and can highly recommend the Du-Bro Kwik-Fill
Fueling Valve, P/N 334 and a SIG Fueling Valve Mounting Bracket,
P/N SIGSH759.
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