> My question(s):
>
> 1) if there is (as I suspect) foreign material in the tank, I can't see
> it by sloshing what little gas that's in it around.  Would it be
> incredibly stupid to rinse the tank out (in fact FILL it) with water and
> try to get whatever out? I could let it sun for several days and even
> help it dry out with a small fan.
>

I would rinse, slosh, etc. thoroughly with water and then get the water
out by rinsing with alcohol, maybe a pint or a quart, twice.

good luck, don't inhale
Larry A.