There are some very specific standards about the engineering of boat fuel
systems. One rule i recollect is that, with the exception of diesel tank
drains, all plumbing, whether for fills, vents, supplies or returns, should
be to the top of the tank. I'd ask my insurer, or their favorite surveyor,
which set of rules they prefer to go by.

wrote in message
...
I am installing a new engine in my Morgan OI41. Since the main tank
(mounted on the stbd side against the hull) was 30 years old I decided
to replace it. Had to cut it out in 3 pieces which means that the
replacement has to be made into 3 separate tanks. I realize that each
of these tanks will need its own vent but I would like to connect the
tanks so that I do not need separate fills and picks up. In other
words I want to join them with a flow-thru at the bottom so that when
I fill the first tank it flows into the other two.

This means joining the tanks in some way. I have a tank builder (in
Miami, Florida) who is proposing to connect them with 1 1/2
connectors. However he is unable to adequately explain how he
proposes doing this I am hoping that someone in this group has had
experience in replacing (and connecting) replacement tanks.

Any suggestions will be appreciated.

Joe