On Tue, 06 Nov 2007 09:01:10 -0600, observer wrote:

I've been outa the boat scene for 30 years but at that time I had a
18' outboard. I recall we had 2 metal 6 gal tanks (not built in) and
I think another metal 12 or 18 gal tank. Nowadays are the tanks
still metal or heavy plastic? And do they still have 6 gal tanks for
the outboard motors? Just trying to catch up with the same boats of
today. thanks.

Metal tanks? That goes back a ways.

The late model tanks are made of a poly material with integral vents
in the filler caps. They are fairly strong, but will tend to flex if
left in the sun for a while if you don't have the cap vented - just
like the gas can you use on your lawn equipment but not as bad as they
have thicker sides.

It all depends on the boat with respect to internal tanks.