Filling holes in sheet metal around penetrations?

[Kooshball]

I don?t (yet) have an RV but in tracking down cold air drafts in my plane I have found areas where fuel lines (at the fitting) pass through the fuselage behind the wing fairing. I would like to fill the holes but since a fitting is there I don?t think RTV is appropriate. The gap is also quite large (1.5? hole with 1/2? or 3/4? fitting in the middle).

Any thoughts on what I should use for this application?

Thx.

[fixnflyguy]

Find large area rubber grommets, cut to slip over fuel lines and seal in place with RTV or make from dense foam rubber disc with slot cut like a grommet . I have done both methods many times. The foam is cheap, easy and with practice will look very tidy and light.

[JonJay]

If the fitting is indeed ?in the middle?, that is not good practice. The line should extend beyond the hole with the fitting on one side or another.
I like the foam plug idea but it will need to be easily removable so you can inspect the fitting. It might not be a bad idea to use a light colored foam so you can see a leaky fitting easily.