http://auto.howstuffworks.com/fuel-efficiency/fuel-consumption/gas-pump-full-tank.htm
On Sat, Aug 16, 2014 at 1:03 AM, Stuart MacMillan <stuartmacm@gmail.com>
wrote:
> That happens to me sometimes as well, and I have a new tank and all the
> plumbing.
>
> It's all about pump flow speed. Gas pumps send rapid pulses of air down
> the fill pipe and can detect the frequency change of the pulses bouncing
> back, which gets faster as the fuel rises in the fill pipe. Kind of like
> air radar. Sometimes fuel just rises in the neck too fast for the system to
> work properly. I also think the camel hump tank Vanagons have contributes
> to this (not in the Syncro tank though, which is designed to hold fuel and
> not to have an obsolete heater duct pass through).
>
> That's why position in the neck and fill speed can have a dramatic effect,
> and it's really about slowing down flow for the last gallon or so.
>
> Stuart
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of PB
> Sent: Friday, August 15, 2014 7:07 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Don't top off gas tanks
>
> Great thread! I've been meaning to ask about this. When I put gas in my
> 90 Westy automatic, the pump doesn't stop, and the gas spills out exactly
> as if I had attempted to top it off. It wasn't always this way, but it
> seems to be getting worse each time. What needs to be fixed? I guess in
> the meantime I guess I should aim for a 3/4 tank "fillup," and not wait for
> the pump to stop. After the spilled gas dries, there are no fumes. I live
> in Cali, where the pumps are all self-service.
> Patti
> 90 Westy automatic
>
>
> On Fri, Aug 15, 2014 at 5:30 PM, OlRivrRat <olrivrrat@comcast.net> wrote:
>
> > James
> >
> > Actually the Vanagon Evap'System is designed to deal with
> > LiquidGasoline ~ Each ExpansionTank has a ReturnHose from its low
> >
> > point back to the GasTank & in a lot of cases it is ThoseHosesAlone
> > that are the Cause of The GasFumeSmell on FillUp even if you don't
> >
> > TopItOff as their ConnectionPoint to the GasTank is FairlyLow ~
> >
> >
> >
> >
> >
> > ORR ~ DeanB
> >
> > On 15 Aug , 2014, at 4:17 PM, James wrote:
> >
> > > Dean,
> > >
> > > Frank Condelli found one of the two plastic vapor canisters above
> > > the
> > front wheels was cracked this spring and he patched it, as those
> > beasties are NLA. Haven't had the other one down to look at it.
> > >
> > > But this is not first vehicle I've had that gives gas fumes after
> > refuelling if the tank is filled too high - have had that with other
> > VWs, Toyotas, a Dodge, and my mother's Pontiac. Filling a gas tank to
> > the brim just overwhelms the evaporative emissions system, which is
> > designed to control a certain amount of vapor, not liquid.
> > >
> > > James
> > > Ottawa, ON
> > >
> > >
> > >
> > > > Date: Wed, 13 Aug 2014 13:41:17 -0600
> > > > From: OlRivrRat@COMCAST.NET
> > > > Subject: Re: Don't top off gas tanks
> > > > To: vanagon@GERRY.VANAGON.COM
> > > >
> > > > James
> > > >
> > > > If all of your GasTank & ExpansionTank
> > > > Seals&Grommets&ConnectingHoses
> > are In GoodShape & DoingTheirJob Properly you ShouldNot
> > > >
> > > > get any GasFumeSmells even if you FillItToTheBrim ~ You should
> > > > look
> > into what might be leaking & get it replaced or Just Do a Complete G'T'
> > > >
> > > > Reseal ~
> > > >
> > > > ORR ~ DeanB
> > > >
> > > > On 13 Aug , 2014, at 1:09 PM, James wrote:
> > > >
> > > > > Hi Roy,
> > > > >
> > > > > If you read your owner's manual, you are NOT supposed to 'top off'
> > the tank in a Vanagon - you are to stop fueling when the pump kicks
> > out the first time, according to VW. There's very little vertical
> > height between the top of the gas tank in our beloved vans and the
> > evaporation control tanks and gear - I asssume that's why the warning.
> > Certainly on our '91 if I top off the tank (only did it once) I get
> > strong gas fumes, but if I stop when the pump kicks out, then the
> > fumes don't happen (except on really hot days, if I park soon after
> fueling).
> > > > >
> > > > > James
> > > > > Ottawa, ON
> > > > >
> > > > >> Date: Sat, 9 Aug 2014 02:34:18 -0300
> > > > >> From: RNicholl@NBNET.NB.CA
> > > > >> Subject: Fresh water tank leaking via vent.
> > > > >> To: vanagon@GERRY.VANAGON.COM
> > > > >>
> > > > >> All,
> > > > >>
> > > > >> I seem to recall very topic being posted to the list not that
> > > > >> long
> > ago, but seem unable to find it searching my Vanagon folder ... I
> > apologise in advance for the redundancy.
> > > > >>
> > > > >> The 3.5 year old and I have been on the road for almost a week
> > > > >> in
> > our new-to-us '88 Westfalia ... which my son has aptly and
> > affectionately named "The Hyena" {Sorry Don.}. Things are well
> > mechanically thus far - the only issue is the lines to the overflow
> > tanks need to be replaced. I bought some line in Calgary and will
> > attend to it, the first chance I get. In the interim, you stop filling
> when the pump kicks out.
> >
>
>
>
> --
>
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