Steve,

I like your system. It seems like a reasonable approach. One thing
I would like to be able to do is polish one tank while using the
other though. One point that Rich makes is that a recirc system can move
fuel much faster due to the the large effective pore size of the
depth filter. Placing a 2 uM filter after the TP filter does negate that
advantage. I was planning on doing exactly that as well because the
TP filter would seem to be susseptable to shedding. It sounds from
your experience that is not the case. Perhaps there is a little bit of
shedding
right at the beginning but anything shed would be quickly removed on
a subsequent pass or by the engine filters.

Doug

"Steven Shelikoff" wrote in message
...
Rich,

I appreciate that you seem to be an expert on filtering theory even
though you also seem to lack the practical experience of actually using
the TP or PT depth filters we're talking about. I realize you don't
think they work. Even so, I'd love to hear your expert opinion
(absolutely no sarcasm intened) on why my Racor 2uM filter has lasted so
long (2 years now and still not clogged) after installing a TP prefilter
when I completely clogged two of the same filters in 20 minutes each
before installing the TP prefilter.

Steve

On Fri, 5 Dec 2003 10:32:23 -0500, "Doug Dotson" wrote:

Steve,

I like your system. It seems like a reasonable approach. One thing
I would like to be able to do is polish one tank while using the
other though. One point that Rich makes is that a recirc system can move
fuel much faster due to the the large effective pore size of the
depth filter. Placing a 2 uM filter after the TP filter does negate that
advantage. I was planning on doing exactly that as well because the
TP filter would seem to be susseptable to shedding. It sounds from
your experience that is not the case. Perhaps there is a little bit of
shedding
right at the beginning but anything shed would be quickly removed on
a subsequent pass or by the engine filters.

I would still put a filter after the TP filter just to be sure. If not
a 2uM, then maybe a 10uM or 15uM. On my system, there's still the
engine mounted final filter after the TP and the Racor. But that one is
a bit more of a pain to change so I really want to keep the fuel to it
as clean as possible. That's why I use the 2uM.

Steve

I also have an on-engine filter that is a pain to change, but putting a
fine filter prior to the lift pump is what caused it to fail. Another reason
to install a permanent electric pump.

Doug

"Steven Shelikoff" wrote in message
...
On Fri, 5 Dec 2003 10:32:23 -0500, "Doug Dotson" wrote:

Steve,

I like your system. It seems like a reasonable approach. One thing
I would like to be able to do is polish one tank while using the
other though. One point that Rich makes is that a recirc system can move
fuel much faster due to the the large effective pore size of the
depth filter. Placing a 2 uM filter after the TP filter does negate that
advantage. I was planning on doing exactly that as well because the
TP filter would seem to be susseptable to shedding. It sounds from
your experience that is not the case. Perhaps there is a little bit of
shedding
right at the beginning but anything shed would be quickly removed on
a subsequent pass or by the engine filters.

I would still put a filter after the TP filter just to be sure. If not
a 2uM, then maybe a 10uM or 15uM. On my system, there's still the
engine mounted final filter after the TP and the Racor. But that one is
a bit more of a pain to change so I really want to keep the fuel to it
as clean as possible. That's why I use the 2uM.

Steve

I also have an on-engine filter that is a pain to change, but putting a
fine filter prior to the lift pump is what caused it to fail. Another reason
to install a permanent electric pump.

Doug

"Steven Shelikoff" wrote in message
...
On Fri, 5 Dec 2003 10:32:23 -0500, "Doug Dotson" wrote:

Steve,

I like your system. It seems like a reasonable approach. One thing
I would like to be able to do is polish one tank while using the
other though. One point that Rich makes is that a recirc system can move
fuel much faster due to the the large effective pore size of the
depth filter. Placing a 2 uM filter after the TP filter does negate that
advantage. I was planning on doing exactly that as well because the
TP filter would seem to be susseptable to shedding. It sounds from
your experience that is not the case. Perhaps there is a little bit of
shedding
right at the beginning but anything shed would be quickly removed on
a subsequent pass or by the engine filters.

I would still put a filter after the TP filter just to be sure. If not
a 2uM, then maybe a 10uM or 15uM. On my system, there's still the
engine mounted final filter after the TP and the Racor. But that one is
a bit more of a pain to change so I really want to keep the fuel to it
as clean as possible. That's why I use the 2uM.

Steve

On Fri, 5 Dec 2003 10:32:23 -0500, "Doug Dotson" wrote:

Steve,

I like your system. It seems like a reasonable approach. One thing
I would like to be able to do is polish one tank while using the
other though. One point that Rich makes is that a recirc system can move
fuel much faster due to the the large effective pore size of the
depth filter. Placing a 2 uM filter after the TP filter does negate that
advantage. I was planning on doing exactly that as well because the
TP filter would seem to be susseptable to shedding. It sounds from
your experience that is not the case. Perhaps there is a little bit of
shedding
right at the beginning but anything shed would be quickly removed on
a subsequent pass or by the engine filters.

I would still put a filter after the TP filter just to be sure. If not
a 2uM, then maybe a 10uM or 15uM. On my system, there's still the
engine mounted final filter after the TP and the Racor. But that one is
a bit more of a pain to change so I really want to keep the fuel to it
as clean as possible. That's why I use the 2uM.

Steve