Posted by Michael Pardee on April 12, 2007, 3:56 am
> Michelle Steiner wrote:
>> The bladder is because of emissions controls in the US.
> Excuse my ignorance but what emissions are you talking about? The tiny
> amount of vapour that escapes from the tank when you fill up???
> It must be some kind of inside joke that the USA cares about the vapour
> emissions from inside the fuel tank of a Prius when almost no other
> vehicle has a bladder and the emission is tiny compared to what comes out
> of the exhaust pipe.
> Surely it would be far more beneficial to limit contaminants in fuel like
> sulfer in diesel which still has absurdly high limits in the U.S. compared
> to other countries rather than imposing a stupid design feature for a
> market that doesn't have a noticeable benefit!
Evaporative control has been a focus here for a couple decades. It must have
been about ten years ago that gas pumps nationally had to be fitted with
vapor return systems. Evap control is important enough that monitoring is
required in OBDII, since 1996.
Hydrocarbons are an important constituent of photochemical smog and a source
of ground level ozone. Many large US cities are in violation of EPA ozone
standards too much of the winter.
Mike
Posted by Elmo P. Shagnasty on April 12, 2007, 12:40 pm
> It must have
> been about ten years ago that gas pumps nationally had to be fitted with
> vapor return systems.
Nope.
None here.
Not a federal mandate in the least.
Posted by on April 12, 2007, 1:14 pm
>> It must have
>> been about ten years ago that gas pumps nationally had to be fitted with
>> vapor return systems.
> Nope.
> None here.
> Not a federal mandate in the least.
Every now and then when I'm filling up at an obscure location, I find the
pump spout a little light. I look, ah! No vapor recovery. Then I wonder why
this particular station hasn't gotten up to speed. Seeing that just about
every gas pump in locations I visited in Colorado two years ago were minus
recovery systems I'll stick my neck out and say it's probably a state
mandated thing with their own time tables. I welcome a correction if I'm
wrong about this.
Posted by Mike Rosenberg on April 12, 2007, 8:22 pm
> Every now and then when I'm filling up at an obscure location, I find the
> pump spout a little light. I look, ah! No vapor recovery. Then I wonder
> why this particular station hasn't gotten up to speed. Seeing that just
> about every gas pump in locations I visited in Colorado two years ago were
> minus recovery systems I'll stick my neck out and say it's probably a
> state mandated thing with their own time tables. I welcome a correction if
> I'm wrong about this.
As far as I know, and I could be wrong about this, too, it's up to the
individual state whether to require this _and_ whether that requirement
is state-wide or just in more heavily populated areas. I know I've been
in states (and please don't ask me to remember which) where the pumps in
rural areas haven't had recovery systems but the pumps in urban areas
have.
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Posted by Michael Pardee on April 12, 2007, 6:30 pm
>> It must have
>> been about ten years ago that gas pumps nationally had to be fitted with
>> vapor return systems.
> Nope.
> None here.
> Not a federal mandate in the least.
Don't know about a federal mandate on that, but in Arizona we got those
bulky bellows things for a while about the same time California did it.
Later they were changed out for the type that didn't form a seal but had a
coaxial recovery system. The only visible difference was the hose was
thicker; more like 2 inch diameter than 1 inch.
Where are you located?
Mike
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>> The bladder is because of emissions controls in the US.
> Excuse my ignorance but what emissions are you talking about? The tiny
> amount of vapour that escapes from the tank when you fill up???
> It must be some kind of inside joke that the USA cares about the vapour
> emissions from inside the fuel tank of a Prius when almost no other
> vehicle has a bladder and the emission is tiny compared to what comes out
> of the exhaust pipe.
> Surely it would be far more beneficial to limit contaminants in fuel like
> sulfer in diesel which still has absurdly high limits in the U.S. compared
> to other countries rather than imposing a stupid design feature for a
> market that doesn't have a noticeable benefit!