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Testing fuel tanks.

Here is how I did it.
Cut a small hole in a latex glove, tie the open end of the glove off.  Tie
the finger onto the tank air vent or fuel outlet. seal the gas cap.  with a
surgical hose tightly clamped to the air vent blow up the glove balloon with
your mouth and tie it off.  I then used soapy water in a plastic bottle to
check the gas cap, balloon, vents etc for leaks and then I measured the
diameter of the glove, noted the barometric  pressure and came back the next
day.  If all is well mark on BL50 with permanent marking pen you tested the
tank and go forward.  No need for air pressure or vacuum cleaners etc.  They
are too dangerous.

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.