AutoStop was a brand of device that used bleeder port liquid pressure to
block the filler port once the tank was "full" but those are long gone.
The newer Westy tanks have a simple float on a lever which blocks the
filler port once the liquid level raises the float high enough.

Mark

David McNeely wrote:
>.......
>
> BTW, when I filled the new tank, advertised by GoWesty as having a volume
> of 3.3 gallons, after purging it took 2.58 gallons.  Given that the tank is
> "full" at 80%, and that purging put a tad in, that is almost exactly what
> it should take (80% of 3.3 is 2.64).  Still no gauge, a bummer, that would
> help.  I'm still not sure how "autostop" works.  Backpressure stops the
> flow when the tank reaches 80% of capacity, right?  The fill valve on the
> new tank still required an adapter.  I thought not needing that was one
> advantage of the newer hardware.
>
> mcneely
>