Doug - Since you're messing around with changes, you might what to have a
look at what friend Ray did for ideas if nothing else. See:
http://sundowner.thebilge.com/fuelsystem.htm
Len

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"Doug Dotson" wrote in message
...
I'm building a whole new unit for all the uptakes and returns. My
tanks are built-in. Integral to the hull. A plate containing everything
bolts through the top of the tank. But if I decide to place the return
for the polishing system at the opposite end of the tank, I'll have to
fashion a second unit at the opposite end.

Doug
s/v Callista

"Len Krauss" wrote in message
...
That works. I put the pickup at bottom and return at top thru the filler
hole. Some people use the tank return -- they remove hose or have a
three-way valve. You might be able to connect a hose to your
draincock --
which would simplify things.
Len

I had thought of a bubbling mechanism to stir the tank while
polishing.
Also thought if the return from the polishing system was placed at the
opposite end of the tank from the uptake it might keep things mixed
up a bit. I have a draincock at the lowest of each of my tanks so
draining
out water and a bit of sediment is pretty easy.

Doug

"Len Krauss" wrote in message
...
Concerns were expressed on this thread about pulling too much flow
thru
a
polishing filter. I polish with a Racor 500 in a stand-alone system.
Some
time ago I called Racor and found out it's cartridge is rated for
20-25psi.
I equipped my polishing system with a vacuum gauge, same as on my
engine.
Vacuum can then be monitored and regulated in a couple ways. One way
is
variable speed pump. The other uses a bypass valve, so that not all
fuel
being pumped goes thru pump. I'll usually keep the filter vacuum
around
10
psi to be conservative. When it rises 5psi that's sign the filter is
getting
clogged.

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.

Before "bubbling" the tank or doing anything else, first pump a
quart
or
two
off the bottom into glass jar and check for water. And continue
this,
discarding the water, until no more is seen.

FWIW.
Len

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