I suspect that finding an RTV sealant that will stand up to the
witch's brew that's currently sold as 'gas' will be a real challenge.
Gasoline tends to turn RTV into jelly,  Maybe 'gas' is different.

Jim

Happiness does not reside in strength or money; it lies in rightness
and many-sidedness.
--Democritus

On Sep 17, 2012, at 2:42 PM, neil n wrote:

> Hi Richard.
>
> If I were to take Bentley a little less than literally, my guess is
> they mean "re-seal" as in install new part(s) necessary.
>
> I too would think that adding sealant to the tank seals is not
> required.
>
> The worst part for me, on the older larger style filler neck, is
> alignment and possible too close proximity to the frame rail.
>
> image: https://lh5.googleusercontent.com/-93VSpTccFgc/TQvyNaIMO2I/AAAAAAAAEOg/3zKWY58Rwfk/s720/GasTankFillO_ring.jpg
>
> entire album with arcane notes.  < grin >
>
> https://picasaweb.google.com/musomuso/GasTank#
>
> Neil.
>
>
> On Mon, Sep 17, 2012 at 2:02 PM, Richard A Jones
> <Jones@colorado.edu> wrote:
>
>>
>> Anyway, I have a new grommet to install.  Bentley says
>> to check for leaks  and "seal if necessary."  How would
>> I seal it?  A ring of RTV before I inserted the filler
>> tube?  I don't see any evidence of sealant on the old
>> grommet, so it must have sealed well for about 30 years
>> before starting to leak.  ('81 Vanagon)