At 01:03 PM 4/2/2010, Scott Chapman wrote:
>Does a Marshall 290 have a proper, new style, full indicator?

That's the regulator, it knows nought about what's in the tank.

>I think I saw a page somewhere saying the original tank's full indicator
>is not according to modern spec or some other aspect of the tank
>(besides the fill connection itself) was not up to modern spec.

There is no float-based Overfill Preventatatation Device in the
original tanks.  They have a threaded hole at the 80% capacity mark
which either connects to a manual bleed valve (to be opened while
fueling) or to the famously cranky AutoStop valve (whose vent valve
also must be opened while fueling).

In the first case, when liquid sprays from the vent valve the
attendant stops filling.  In the second case when liquid sprays from
the vent valve, the main valve -- if it's working right -- shuts off
against the incoming flow.

OPDs are now required in BBQ tanks, but to the absolute best of my
knowledge there's no such requirement for ASME-rated tanks.

Yrs,
D