Date: Mon, 26 Oct 2009 19:01:57 -0400
Reply-To: W Monk <billmonk@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: W Monk <billmonk@GMAIL.COM>
Subject: Re: Expansion Tank Hose Weeps: Fuel Tank Full
In-Reply-To: <COL119-W1786070B8D4AC919D5B2DFDBBA0@phx.gbl>
Content-Type: text/plain; charset=ISO-8859-1
The expansion tanks are meant really only for vapors. They still have a
valve
built in so if the vehicle was to roll over the gas wouldn't leak out after
it has
entered the tanks. Otherwise,I think what happens is when the seals
or hoses start to leak on top of the tank it messes with the auto shut off
on the gas pumps. This makesit is so you an add more gas to your tanks than
one usually would be able to get in there. Also keep in mind vapors contains
moisture. With a change in temps some of the vapors may turn into some
moisture
on the top of the tank. Like a small greenhouse effect. I would'nt try and
remove
the tanks as they are their for the expansion of the vapors because of the
saddle in
the middle of the main tanks. I have one NOS rollover vapor valve that goes
into
the top of the expansion tanks. I had to buy a couple one time as I was not
having
good luck replacing those grommets. I ended up with a spare, so if someone
had broken off the plastic nipple and need one let me know.
B
On Mon, Oct 26, 2009 at 6:23 PM, Edward Duntz <eduntz@hotmail.com> wrote:
> It is my understanding that the expansion tanks are for expansion of gas
> vapor, not liquid gasoline.
>
> The top of the filler pipe is indeed higher than the tank, but the gasoline
> shouldn't get right up to the top when filling. The gas pump should stop it
> well before that, and also, on later models, there is a piece in the bottom
> of the filler pipe where it goes in the tank to prevent this as well. It
> looks like a ping-pong ball inside a small plastic cage.
>
> I know of a guy who has totally removed both of his expansion tanks and he
> says he has experienced not ill effects. I'm not recommending it, because I
> don't know enough about the system to know whether they're necessary, and it
> apparently may depend on the ambient temp?
> >
> > Not sure if expansion tanks end up with fuel in them when at gas
> > station and filler pipe filled to top, but maybe later on if
> > conditions caused fuel to expand enough. (hot day, altitude maybe
> > too?)
> >
> > My understanding is that the expansion tanks are there (in part
> > maybe?) for that reason.
> >
> > The top of the filler pipe is higher than the tank so I"m thinking
> > that at least the fuel expansion tank hoses would fill with fuel when
> > filler pipe filled to/near top.
> >
> > Neil.
> >
>
>
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