Subject: Fuel transfer/polishing pump
From: "Doug Dotson"

Makes sense, but there is quite alot of evidence out there that
a polishing system is a good thing to have. I can't really
increase the size of my on-engine filter. I could increase the
size of the Raycor, but at the pore sizes I run (30 micron) in it make it
necessary to change the on-engine filter regularly as well.
Bigger Raycor won't fix the problem.

What's the GPH on your engine?

If you go to a larger Racor you could easily change to a smaller micron
element. It fact, I have never understood why people don't run as small a
micron element as they can in the first filter after the fuel tank. Why let
anything near the micron size of the engine mounted filter get to that filter
at all?

Capt. Bill

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

Makes sense, but there is quite alot of evidence out there that
a polishing system is a good thing to have. I can't really
increase the size of my on-engine filter. I could increase the
size of the Raycor, but at the pore sizes I run (30 micron) in it make it
necessary to change the on-engine filter regularly as well.
Bigger Raycor won't fix the problem.

What's the GPH on your engine?

1 GPH is what I consume. Don't know the fuel return rate.

If you go to a larger Racor you could easily change to a smaller micron
element. It fact, I have never understood why people don't run as small a
micron element as they can in the first filter after the fuel tank. Why
let
anything near the micron size of the engine mounted filter get to that
filter
at all?

Because small filters ahead of the lift pump stress the pump and cause
premature failure. No fun.

Capt. Bill

Subject: Fuel transfer/polishing pump
From: "Doug Dotson"

Because small filters ahead of the lift pump stress the pump and cause
premature failure. No fun.


Not if you run a large enough (as in surface area) filter and change it
regularly. At 1 - 5 gph through a Racor 900 I don't see how you could over
stress a well built lift pump.


Capt. Bill

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.

Doug

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

Because small filters ahead of the lift pump stress the pump and cause
premature failure. No fun.


Not if you run a large enough (as in surface area) filter and change it
regularly. At 1 - 5 gph through a Racor 900 I don't see how you could over
stress a well built lift pump.


Capt. Bill

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

Subject: Fuel transfer/polishing pump
From: "Doug Dotson"

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.

Did your sails fail too? :-)

And didn't you say you had electric priming pumps?
If so, why did you not use those to run the engine?

Capt. Bill

Subject: Fuel transfer/polishing pump
From: "Doug Dotson"

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.

Did your sails fail too? :-)

And didn't you say you had electric priming pumps?
If so, why did you not use those to run the engine?

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

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