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.

There is a finite amount of filter-clogging gunk in your fuel system at any given time,
the more of it gets in your filter, the less stays in the system (and potentially ends up
in the injector pump & injectors). A filter element that does not clog up as quickly is
either 1- bigger and can thus hold more gunk OR 2- is letting a lot of the gunk pass
thru. QED


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.

Sounds good but it might take a while.



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?

At Trawlersfest I had two lengthy discussions with paper towel filter advocates. Their
theory is that the random oriented strands of the paper towel can trap any size particle,
down to sub-micron, instead of acting like a sieve to pass through anything below a given
size (they like to avoid mentioning that the "sieve" stops anything above it's rated
size). However they never explained why the filters don't clog up if they are indeed
trapping particles, or why particles can't become dislodged and re-enter the system.
Also, the paper towel systems they were advocating were all "bypass" filters, ie on the
pressure regulator discharge rather than on the main loop, so they did not filter more
than a small percentage of the fuel being pumped. This is due to the fact that paper
towels can't withstand a very high differential pressure.

Fresh Breezes- Doug King

"DSK" wrote in message
...
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.

There is a finite amount of filter-clogging gunk in your fuel system at
any given time,
the more of it gets in your filter, the less stays in the system (and
potentially ends up
in the injector pump & injectors). A filter element that does not clog up
as quickly is
either 1- bigger and can thus hold more gunk OR 2- is letting a lot of the
gunk pass
thru. QED

The filter on the engine seems to prevent ,ost remaining gunk from reaching
the injector pump and injectors. It must since it seems to be the one that
was clogging up most.

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.

Sounds good but it might take a while.

Take a while to what? Polish the tank?



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?

At Trawlersfest I had two lengthy discussions with paper towel filter
advocates. Their
theory is that the random oriented strands of the paper towel can trap any
size particle,
down to sub-micron, instead of acting like a sieve to pass through
anything below a given
size (they like to avoid mentioning that the "sieve" stops anything above
it's rated
size). However they never explained why the filters don't clog up if they
are indeed
trapping particles, or why particles can't become dislodged and re-enter
the system.
Also, the paper towel systems they were advocating were all "bypass"
filters, ie on the
pressure regulator discharge rather than on the main loop, so they did not
filter more
than a small percentage of the fuel being pumped. This is due to the fact
that paper
towels can't withstand a very high differential pressure.

According to RichH, the rated size of a filter is based upon what size
particles
it can remove on a single pass. A polishing system recirculates and each
pass
through the filter removes more because a filter is much more than just a
fancy
sieve. I dunno.

Fresh Breezes- Doug King

Sounds good but it might take a while.

Doug Dotson wrote:
Take a while to what? Polish the tank?

Transfer is what I was thinking of. It's a good idea to have a polishing system
that you can run underway so when the tanks start sloshing, you can get the crud
that is getting stirred up out of there.


.... A polishing system recirculates and each
pass
through the filter removes more because a filter is much more than just a
fancy
sieve. I dunno.

Sounds good in theory, and as Steve says his TP filters get a lot of gunk out of
there. But I still have no confidence at all that they are not shedding gunk
too. So, if a TP filter grabs X amount of gunk on Y passes, then a proper filter
element would grab ? on fewer passes? Of course you need to change it, and a lot
of the paper towel/TP filter theory seems to revolve around the idea that you
shouldn't have to change filter elements, which is silly IMHO. Filter elements
are the cheapest insurance you can get for your engine.

BTW set up the polishing/transfer pump so it can be priming pump too. Saves a
lot of hassle.

Fresh Breezes- Doug King

Doug,

My poslishing/transfer system will be totally separate from the
engine system. I do have an electric priming pump that is a godsend.
Plan on installing dual electric lift pumps on the engine.

Doug

"DSK" wrote in message
...
Sounds good but it might take a while.

Doug Dotson wrote:
Take a while to what? Polish the tank?

Transfer is what I was thinking of. It's a good idea to have a polishing
system
that you can run underway so when the tanks start sloshing, you can get
the crud
that is getting stirred up out of there.


.... A polishing system recirculates and each
pass
through the filter removes more because a filter is much more than just
a
fancy
sieve. I dunno.

Sounds good in theory, and as Steve says his TP filters get a lot of gunk
out of
there. But I still have no confidence at all that they are not shedding
gunk
too. So, if a TP filter grabs X amount of gunk on Y passes, then a proper
filter
element would grab ? on fewer passes? Of course you need to change it, and
a lot
of the paper towel/TP filter theory seems to revolve around the idea that
you
shouldn't have to change filter elements, which is silly IMHO. Filter
elements
are the cheapest insurance you can get for your engine.

BTW set up the polishing/transfer pump so it can be priming pump too.
Saves a
lot of hassle.

Fresh Breezes- Doug King

On Fri, 28 Nov 2003 18:06:22 -0500, DSK wrote:

.... A polishing system recirculates and each pass
through the filter removes more because a filter is much more than just a
fancy sieve. I dunno.

Sounds good in theory, and as Steve says his TP filters get a lot of gunk out of
there. But I still have no confidence at all that they are not shedding gunk
too.
/snip/
Fresh Breezes- Doug King

Actually, 'depth' filters sound TERRIBLE in theory.
Use a what?
A toilet roll? A kitchen roll? Gimme a break.

It is in practice that they do best.
Over the road operators brag repeatedly about astronomical mileages -
some of them practice only filter change and filter bowl oil make up
only... no complete oil changes.

Winnowing through the stuff from true believers, it looks like depth
filters can carry a much larger particle load and can filter to
smaller particulate sizes. They will certainly trap water, though I am
unsure how far that reduces the filtration efficiency and/or increases
particle transmission.

Depth filters have plenty of background: I ran an aircraft rated depth
filter made of deep cloth layers for five years in a light airplane.
The brand was "Winslow" You bet the price did not compare with a
kitchen roll however.

Brian Whatcott Altus OK

About 4 years ago there was a couple guys on the group who managed truck
and heavy equipment fleets. They swore by the paper filters (paper towel
or TP) and used them on their own personal trucks. You could probably
find the threads on google.

Rufus

I believe that was for OIL not diesel.

Rufus wrote:
About 4 years ago there was a couple guys on the group who managed truck
and heavy equipment fleets. They swore by the paper filters (paper towel
or TP) and used them on their own personal trucks. You could probably
find the threads on google.

Rufus


--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

Ahem...you meant mineral lubricating oil, rather than
mineral fuel oil?

Brian W

On Fri, 28 Nov 2003 21:17:43 -0500, Glenn Ashmore
wrote:

I believe that was for OIL not diesel.

Rufus wrote:
About 4 years ago there was a couple guys on the group who managed truck
and heavy equipment fleets. They swore by the paper filters (paper towel
or TP) and used them on their own personal trucks. You could probably
find the threads on google.

Rufus

On Fri, 28 Nov 2003 21:17:43 -0500, Glenn Ashmore
wrote:

I believe that was for OIL not diesel.

Not much difference between diesel and oil.

Steve

Rufus wrote:
About 4 years ago there was a couple guys on the group who managed truck
and heavy equipment fleets. They swore by the paper filters (paper towel
or TP) and used them on their own personal trucks. You could probably
find the threads on google.

Rufus


--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

Ahem...you meant mineral lubricating oil, rather than
mineral fuel oil?

Brian W

On Fri, 28 Nov 2003 21:17:43 -0500, Glenn Ashmore
wrote:

I believe that was for OIL not diesel.

Rufus wrote:
About 4 years ago there was a couple guys on the group who managed truck
and heavy equipment fleets. They swore by the paper filters (paper towel
or TP) and used them on their own personal trucks. You could probably
find the threads on google.

Rufus