On Friday, April 12, 2019 at 2:53:34 AM UTC-5, Steve W. wrote:
> The Real Bev wrote:
> > On 04/05/2019 11:58 PM, Steve W. wrote:
> >> The Real Bev wrote:
> >>> On 04/04/2019 07:14 PM, Steve W. wrote:
> >>>> The Real Bev wrote:
> >>>>> On 04/03/2019 12:24 AM, Steve W. wrote:
> >>>>>> The Real Bev wrote:
> >>>>>>> On 04/01/2019 04:57 PM, wrote:
> >>>>>>>> What has not been breached here - and should have been long
> >>>>>>>> ago - is if the owner was in the habit of topping off when gassing
> >>>>>>>> up at the station: 'click-thunk', 'click-thunk'. That action could
> >>>>>>>> contribute to his 'whooshing' experience.
> >>>>>>> I hear no whooshing sounds and I always do three topoff click-thunks --
> >>>>>>> even then I don't approach spillage level.
> >>>>>>>
> >>>>>> On anything newer than 2000 that is a good way to wipe out the charcoal
> >>>>>> canister. Fuel goes down the vent line attached to the side of the fill
> >>>>>> pipe and drowns the canister.
> >>>>> How far from the top is the vent line attached? LA County filler tube, BTW.
> >>>> Most are just below the flapper valve in the filler neck.
> >>> From what I read, that closes when fuel gets high enough in the neck,
> >>> right? I would assume that it's located to prevent overflow...
> >>>
> >>> What actually makes the nozzle shut off? Upon occasion I've put in at
> >>> least another gallon after the first automatic click-thunk shutoff. I
> >>> like to fill it as full as possible -- you never can tell when you'll
> >>> just be able to make it to the Mesquite station on fumes because it was
> >>> too hard to find a cheap gas station in Vegas.
> >> No the flap I'm talking about is the one the fuel fill nozzle opens just
> >> below the cap. That stays open while filling to allow vapor to pass the
> >> pump nozzle. It acts as a valve to keep debris out as well as a
> >> restriction to keep people from using the wrong pump to fill the tank
> >> (diesel usually has a larger nozzle diameter that won't fit) Plus it
> >> helps prevent the fuel from pouring out at the instant the nozzle trips off.
> >
> > I first saw those when unleaded became the only option (remember smog
> > heads?) and thought it was just to restrict the size of the nozzle that
> > could be inserted.
> >
> >> The nozzle shuts off when it detects a change in vacuum inside the
> >> handle. If you look inside a nozzle you will see a small hole or tube
> >> inside. While filling the gas flow over the hole/tube creates a vacuum.
> >> While gas is flowing that vacuum doesn't do much. However as soon as the
> >> tank is full the gas backs up in the fill neck. That blocks the
> >> tube/hole and the instant lack of vacuum trips a small diaphragm inside
> >> the filler handle which stops the fuel.
> >
> > Given my sinful triple-top-up procedure, I've observed that different
> > pumps have different levels of stoppage. Is there an actual standard?
> >
>
> Most of the time the "standard" is simply that it shuts off before it
> sprays you with fuel.
> It all depends on the flow rate from the pump and how well the fuel tank
> accepts high flow of fuel. Get a real fast pump and try feeding some of
> the imports where the fuel neck is just a hair larger than a garden hose
> and it can be interesting. Most vehicles have multiple restrictions in
> the filler neck and tank as well. Things like a screen to prevent
> siphoning or the rollover ball in the top of the tank or the vapor vent
> from the tank being small.
>
> --
> Steve W.

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