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John,  I just had to fix the same problem.  I just had the plane (iv-p)
painted.  One of the reasons for painting was paint bubbling due to fuel
leaking through eight pinholes in the upper skin.  We sanded down to
primer/carbon and as Charlie Kohler suggested applied positive pressure to
the tank through the vent line after selecting "off" on the fuel selector
switch.  The skin was coated with soapy water and bubbles were observed.
Then you have to put a thin layer of epoxy on the surfaces where the
pinholes were found.  Then a negative pressure is applied to the tank to
draw the epoxy into the pinholes and allowed to cure.    Repeat to verify no
bubbling.  I'll post again if the leaks recur.  Maybe you can figure out
where your leaks are by looking also for the green residue that av. gas
leaves behind. Unfortunately, I suspect you will have to do some sanding,
but since the problem isn't going to get well on its own.......John Wright
Col Springs

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