Steve,

Your approach is pretty much the solution I am tending towards. Polish
using a papertowel filter followed by a Raycor. I also can't believe that
some dust dosen't come out of the PT filter so a Raycor following seems
the solution.

Doug
s/v Callista

"Steven Shelikoff" wrote in message
...
On Fri, 28 Nov 2003 11:03:52 -0500, "Doug Dotson"
wrote:

This helps alot, thanks! LaBomba suggested that just amking
the primary filter bigger would solve the problem. I was thinking
that this might be a easier solution, but it appears that a separate
polishing system does have advantages over just using a filter
that does not clog up so quickly. My intended strategy is to oly
fill one tank at a time, set the newly filled tank to polishing while
running the engine off of the other tank. Then when the engine
tank gets low, switch the engine to the polished tank, then
fill and polish the other tank. That way I always have clean
fuel ready and waiting (and plenty of it) and I don;t have to rush
to fill again.

I'm still in a quandry about Raycor style filters vs the paper towel
roll type. Perhaps RichH will chime in on this one since he is an
expert on filtration systems. Does Safeway carry 15 uM paper towels?

RichH doesn't like the paper towel or TP filters. He's said they shed
material and that they can pass some fluid unfiltered by the edge.
This, I agree, makes them unsuitable as the only filter for an engine.
However, I think they are great for fuel polishing very dirty fuel *if*
you have a good quality filter, like a Racor, after them to trap any
shed material and the tiny percentage of unfiltered fuel. For
recirculating fuel polishing, it doesn't matter if they let some
unfiltered fuel past since it'll get filtered next time around. And
I've found that the Racor beyond the paper filters last *much* longer
trapping the tiny amount of shed fibers from the TP filter then if they
got the dirty fuel directly without the TP filter.

The main advantage of the paper depth filters is that they can filter
down to very small particle size and they can hold a whole lot of crud,
large and small, without clogging up. IOW, perfect for fuel polishing.

On my boat, I got into some rough weather that stirred the fuel up and
clogged the Racor I had at the time in only around 20 mins. I put in my
backup element and it also clogged in around 20 mins. So I was stuck
without a filter. I ended up having to take fuel out of the main tank,
manually pour it through a funnel with a paper towel sheet in it like a
coffee filter and into another tank and run the engine from that with
only the primary engine filter beyond that. The paper towel sheet had
lots of black particles on it after filtering only a small amount of
fuel, like a half gallon.

After that experience, I installed a pair of the TP filters, the walbro
pump, etc., from the trawlerworld site. Without cleaning the tank, I've
not had a single dirty fuel problem since. The used TP rolls come out
with a lot of black on them. The Racor 2 micron filter that's past the
TP filters is now 2 years old and is still clean. I monitor the filter
condition with vacuum gauges.

When I'm polishing, fuel goes through a pair of TP filters and then
through the 2 micron Racor and back to the tank. The fact that the 2
micron Racor is still clean after 2 years with a very dirty tank tells
me that the TP filters are doing something, especially since I clogged 2
of the Racors after 20 minutes without the TP filters.

Fuel going to the engine goes through one more filter, the engine
mounted final filter. I'm not sure what particle size that's rated for
but it's probably a 10 or 15 micron.

Yes, my results are entirely non-scientific. I've not done any
measurements of how well the filters are working. I only know they are
working great for me.

Steve