To install Orv's fuel tank outlet
fitting mod, you will first need to drain all of the fuel out
of your fuel tanks in a well ventilated area away from any flame,
gas vapors hug the ground so be careful. You do this by removing
enough screws on the side of the tub to allow the rear side of
the tub to be pulled away from the fuel tank to allow you to get
your wrenches on the fuel tank fitting and nut.\
Disconnect the fuel line from
the fuel tank fitting. Remove the fittng nut and washer. Pull
the fuel tank outlet fitting out of the bottom of the fuel tank.
Inspect the rubber grommet to insure that it is in good condition.
If not order a new set from the factory.
Once you have the fitting removed,
drill a 3/16" (or close to that) hole in the top of the fitting
as seen in the photo below.
Next take a 10' piece of string
and tie a nut to the end for a weight. The nut on the string is
then dropped into the top of the tank and jiggled until it comes
out the outlet hole in the bottom of the tank.
The photo below shows
the string with the nut weight coming out the bottom of the fuel
tank. The Tootsie Pop is optional. You will notice a lot of rust
and chipped paint on this ship. This is what happens when a frame
is not primed before painting and when the ship is parked outside
in the rain. It took me a week to get this ship airworthy before
we could begin the builders flight training.
Tie the nut end of the
string aournd the landing gear step to prevent it from accidently
being pulled back into the fuel tank.
You will need to purchase
or make a washer that will fit over the fuel tank fitting threads
and bevel but not pass the small shelf at the upper portion of
the bevel. This washer is what keeps the fitting from being able
to exit the bottom of the fuel tank. You can usually find a washer
that is close in size and then file or dremmel out the ID to fit
the fitting. You don't want the washer to contact the bevel to
the point that it does not fit snuggly up against the flat shelf
above the bevel.
The OD of the washer
should be at least 1/4" larger than the OD of the outlet
fitting top. If the washer OD is too large, it may not fit the
space at the bottom of the tank.
Place the washer and
fitting onto the string as shown below.