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I don't believe there will be any electrolytic effects of the aluminum in
gasoline because gasoline is a pretty good insulator (unless there is water
in it) and there wouldn't be any electrically dissimilar material attached
to the aluminum. BUT it is still a good idea to foam around the LE tube and
bid over the works.

Here is the problem. According to my friend Fred Moreno, impact
erosion/damaged increases with (as I recall) the fourth power of velocity.
If you are descending from FL260 at the mach limit and pass on the downwind
side of a TCU you are likely to run into some GR. This will quickly give
your leading edge a complexion that will rival Manual "The Pineapple"
Noriega's. At the bottom of each pit are a series of fractures that lead to
the fuel (there is no core on the leading edge). The wing begins to weep and
the pilot soon follows suit. Many hours cloistered from family and friends
elapse while the impact damage is repaired.

The leading edge is not structural so the repairs are to seal the fuel. If
the fuel seal integrity had not been breached then simpler, cosmetic repairs
are all that would be needed.

IMHO I would pour urethane foam around the tube and 3 BID over it.

Regards
Brent Regan

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