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

See below.

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

I am designing a fuel polishing and transfer system. My thought
is to use valves to route fuel from any tank to any tank. No
problem with that part. I want to be able to just transfer fuel
or switch in a filter to polish the fuel while transferring. Since
I can select the same tank for source and destination, I can
polish fuel in place as well. The problem comes with the selection
of a pump. I was looking at a Groco or Jabsco pump which seems
good for transfer purposes, but way exceeds the flowrate of the
filter when polishing. A Walbro fuel pump (which I have as a priming
pump now) seems like a good fit for polishing (33 GPH) but will be slow
when just transferring fuel. What happens when a 5.5 GPM pump
(Jabsco) is pushing fuel through a filter rated at 60 GPH (RACOR 500)?

Why not just ask Racor?
http://www.parker.com/ead/cm1.asp?cmid=392

It's not a filter question.


Sure it is. It's all interrelated.


And I believe Racors are designed to be drawn through not pushed into.
Again, ask Racor.

From experts I know, pushing fuel through a filter is more efficient.

Yes, but with what type of filter system?
If the filter system is not designed to be "pushed through" you may have a
problem. It may effect the coalescing action.
That's why I said "ask Racor".
Or are they to "experts" you are speaking of?

And fuel "polishing" is a joke IMHO.

And you would be wrong.

Not based on the fact that most people seem to only run their system (if they
have one) or have a company "polish" their fuel at the dock.


Unless the fuel in the tank/s is well stirred up all you are doing is
filtering
what is already clean, settled out fuel.

Well, in an ideal world. Perhaps drawing the fuel into to polishing system
lower
in the tank than that feeding the engine.

You're still just drawing fuel out of one baffeled area of the tank. Unless you
can get all the fuel in the tank stired up really well you are not doing a very
good job of "polishing" it.

Capt. Bill