Most RTV silicones warn against using in the presence of gasoline. Recently
at work we had a training seminar from Henkel, (Loctite). Many silicones
that work buy etching the surface for adhesion. These should not be used on
some aluminum as they will cause surface corrosion. Try that on your
waterboxer head gaskets!

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Jim Arnott
Sent: Monday, September 17, 2012 8:05 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: fuel filler grommet seal

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)