If it is away from the pickup, then it isn't entering into the problem.
If things get stirred up then the polishing system will do its job
better.

Doug

"LaBomba182" wrote in message
...
Subject: Fuel transfer/polishing pump
From: "Doug Dotson"

Yes, but it is better than nothing.


At least for that one baffled area. Which may be on the far side of the
tank
away from the pickup. :-)

Capt. Bill

I assumed it was understood that there would have to be a way for the fuel
to
travel from one baffled area to the next.

And hence the crud as well.

Doug

I assumed it was understood that there would have to be a way for the fuel
to
travel from one baffled area to the next.

And hence the crud as well.

Doug

After having my lift pump fail half way across the Gulf Stream, I think
I'll stick to what Yanmar and the mechanic in FL suggested even
beyond the warranty.

Doug
s/v Callista

"LaBomba182" wrote in message
...
Subject: Fuel transfer/polishing pump
From: "Doug Dotson"

The memo from Yanmar (via Mack Boring) didn't make any distinction
on type of filter. Just the porosity on the element. Perhaps it was a CYA
move to specify anything smaller than 30 uM.


If that's the case, then you have to do what they say.
At least until the warranty runs out. :-)

Capt. Bill

After having my lift pump fail half way across the Gulf Stream, I think
I'll stick to what Yanmar and the mechanic in FL suggested even
beyond the warranty.

Doug
s/v Callista

"LaBomba182" wrote in message
...
Subject: Fuel transfer/polishing pump
From: "Doug Dotson"

The memo from Yanmar (via Mack Boring) didn't make any distinction
on type of filter. Just the porosity on the element. Perhaps it was a CYA
move to specify anything smaller than 30 uM.


If that's the case, then you have to do what they say.
At least until the warranty runs out. :-)

Capt. Bill

On 03 Dec 2003 03:39:16 GMT, (LaBomba182) wrote:

Subject: Fuel transfer/polishing pump
From:

On 29 Nov 2003 20:48:01 GMT, (LaBomba182) wrote:

Subject: Fuel transfer/polishing pump
From: (Steven Shelikoff)

Not much difference between diesel and oil.

Perhaps, but there is a world of difference between the tolerances of a
fuel
injector pump and an oil pump.

True. But that's a red herring since it's not usually the oil pump that
wears out due to dirty lubricating oil.

Not quite. A 350 Chevy engine will run for a long time, years maybe, with dirty
oil.
A diesel injection pump and/or injectors with dirty fuel will not.

Yeah, but after that Chevy 350 engine runs for years with dirty oil,
you'll probably find that the bearing surfaces are more prematurely worn
than the oil pump. The reason is that the bearing surfaces are speced
to operate with clean, filtered lubricating oil. After years of
running, the filter has probably clogged so much that it's always in
bypass mode, and maybe even torn, allowing all the dirt to wear the
bearings. The oil pump, on the other hand (and unlike a fuel injector
pump) is designed to run in dirty oil... so it's tolerances have to be
less. All dirt trapped in the lubricating oil filter has already passed
through the oil pump.

And *that* is why your statement above is a red herring, because the
lubricating pump always pumps pre-filtered oil so it matters very little
what the filter is doing.

By the way, instead of saying "But that's a red herring since it's not
usually the oil pump that wears out due to dirty lubricating oil." I
should have said "But that's a red herring since it's not usually the
oil pump that wears out *prematurely" due to dirty lubricating oil."

Steve

On 03 Dec 2003 03:39:16 GMT, (LaBomba182) wrote:

Subject: Fuel transfer/polishing pump
From:

On 29 Nov 2003 20:48:01 GMT, (LaBomba182) wrote:

Subject: Fuel transfer/polishing pump
From: (Steven Shelikoff)

Not much difference between diesel and oil.

Perhaps, but there is a world of difference between the tolerances of a
fuel
injector pump and an oil pump.

True. But that's a red herring since it's not usually the oil pump that
wears out due to dirty lubricating oil.

Not quite. A 350 Chevy engine will run for a long time, years maybe, with dirty
oil.
A diesel injection pump and/or injectors with dirty fuel will not.

Yeah, but after that Chevy 350 engine runs for years with dirty oil,
you'll probably find that the bearing surfaces are more prematurely worn
than the oil pump. The reason is that the bearing surfaces are speced
to operate with clean, filtered lubricating oil. After years of
running, the filter has probably clogged so much that it's always in
bypass mode, and maybe even torn, allowing all the dirt to wear the
bearings. The oil pump, on the other hand (and unlike a fuel injector
pump) is designed to run in dirty oil... so it's tolerances have to be
less. All dirt trapped in the lubricating oil filter has already passed
through the oil pump.

And *that* is why your statement above is a red herring, because the
lubricating pump always pumps pre-filtered oil so it matters very little
what the filter is doing.

By the way, instead of saying "But that's a red herring since it's not
usually the oil pump that wears out due to dirty lubricating oil." I
should have said "But that's a red herring since it's not usually the
oil pump that wears out *prematurely" due to dirty lubricating oil."

Steve

On Tue, 2 Dec 2003 23:41:45 -0500, "Doug Dotson" wrote:

That may be true, and as long as it stays there the engine still
runs fine. If it does get shaken up, the a polishing system will
do its job while lessing the crud going through the engine filtering
system. Once initial polishing is done, I will be alternating between
tanks. One running while the other polishing. Getting things shaken
up is the best thing I can hope for.

Why not just always leave the polishing system in-line? Allow for a
bypass to change a filter or if it develops a vacuum leak, but other
then that, there's nothing wrong with always using "just polished" fuel.

Steve

On Tue, 2 Dec 2003 23:41:45 -0500, "Doug Dotson" wrote:

That may be true, and as long as it stays there the engine still
runs fine. If it does get shaken up, the a polishing system will
do its job while lessing the crud going through the engine filtering
system. Once initial polishing is done, I will be alternating between
tanks. One running while the other polishing. Getting things shaken
up is the best thing I can hope for.

Why not just always leave the polishing system in-line? Allow for a
bypass to change a filter or if it develops a vacuum leak, but other
then that, there's nothing wrong with always using "just polished" fuel.

Steve

That would require me to have 2 pretty much independent polishing
systems. I don't really have the room for that and the extra
expense would be hard to justify.

Doug
s/v Callista

"Steven Shelikoff" wrote in message
...
On Tue, 2 Dec 2003 23:41:45 -0500, "Doug Dotson" wrote:

That may be true, and as long as it stays there the engine still
runs fine. If it does get shaken up, the a polishing system will
do its job while lessing the crud going through the engine filtering
system. Once initial polishing is done, I will be alternating between
tanks. One running while the other polishing. Getting things shaken
up is the best thing I can hope for.

Why not just always leave the polishing system in-line? Allow for a
bypass to change a filter or if it develops a vacuum leak, but other
then that, there's nothing wrong with always using "just polished" fuel.

Steve