They have to, and there is usually a hole through the baffles at the
lowest point of each baffle.

Doug
s/v Callista

"Len Krauss" wrote in message
...
No offense -- but have you? They're are not solid top to bottom as you
seem
to suggest. The plate bottoms, in particular, usually have tunnels.

--
Eliminate "ns" for email address.

As for stirring up the crud, one guy told me he shoots a jet of air
around
the bottom of his tanks. Has a small L-shaped copper tube on an air
hose,
and with it tied to a dowel/rod pushes it to bottom and "aims" it
around.
He'll them sometimes just let the thing bubble away while polishing to
help
keep particulate matter in suspension.


But he is only stirring up one baffeled area in the tank unless he has
access
plates to each area.

No offense, but how many of you have actually seen the insides of a
elwell
built
marine fuel tank?el

Capt. Bill