I would put it before the racor so it could be used to fill the racor when
you do a filter change.  You have to be careful tho, because some of the
pumps have their own strainer internal to them that could clog up rather
than your racor clogging up.
I have not put mine in yet, but I plan to valve it as a bypass on the fuel
line so normally the fuel would bypass the electric pump.  I am of course
assuming that the electric will be used as a backup pump and not the main
fuel pump

Vance Nelson
Superior Dreams GB32-340
Houghton, MI 49931
KC8RGO

.
----- Original Message -----
From: "Bob Clinkenbeard" clinkenbeardb@bellsouth.net
To: trawlers-and-trawlering@lists.samurai.com
Sent: Wednesday, March 05, 2008 2:12 PM
Subject: T&T: Installing an electric fuel pump for priming and backup

i'd put it after the racor so that it pulls fuel from either tank thru the
racor...  it will refill it after a change yet prevent "stuff" from getting
in the pump (it may have a strainer on the inlet).  Two Tees and two valves
to isolate the pump is all you need.

pascal
miami, fl
70 hatteras 53MY
live helmcam @ www.sandbarhopper.com

----- Original Message -----
From: "Bob Clinkenbeard" clinkenbeardb@bellsouth.net
To: trawlers-and-trawlering@lists.samurai.com
Sent: Wednesday, March 05, 2008 2:12 PM
Subject: T&T: Installing an electric fuel pump for priming and backup

Pascal, I understand your logic, but do not understand how the air in the
racor after a filter change gets out without airlocking the injectors.  I
guess that I am missing something here.  Also most pumps are stronger on the
push side than the pull side, so before the racor has the least resistance.
thanks for any clarification you may have.

Vance Nelson
Superior Dreams GB32-340
Houghton, MI 49931
KC8RGO

----- Original Message -----
From: "Pascal Gademer" pascal@sandbarhopper.com
To: trawlers-and-trawlering@lists.samurai.com
Sent: Wednesday, March 05, 2008 2:45 PM
Subject: Re: T&T: Installing an electric fuel pump for priming and backup

i'm blessed with Detroits and an Isuzu powered Norpro genny!    no worry
with air getting to the injectors! :-)

i woudl guess that with other engines, you'd want send the pump output into
a jug till you have refilled the racor and get good flow, then follow the
normal bleeding procedure?

if you push fuel thru the racor, you're still going to push some air thru
the line anyway, even if you just crack the top of the racor to bleed air,
aren't you?

pascal
miami, fl
70 hatteras 53MY
live helmcam @ www.sandbarhopper.com

----- Original Message -----
From: "Vance Nelson" vbnelson@gmail.com
To: "Pascal Gademer" pascal@sandbarhopper.com;
trawlers-and-trawlering@lists.samurai.com
Sent: Wednesday, March 05, 2008 2:54 PM
Subject: Re: T&T: Installing an electric fuel pump for priming and backup

Vance:

That air must be purged whether the pump is before or after the Racors.
There should be a bleeding valve or screw at the injector pump for this
purpose.  I, like Pascal, placed my electric auxillary pump after my filters
so it would be pumping clean fuel.  It works like a charm.  Suction is
adequate for drawing the fuel through the filter and resistance through the
pump check valves is very low so it does not impede fuel flow when only the
mechanical lift pump is in use.  Of course, other systems and other pumps
may function differently.

Regards,

Wesley
wpeldred@comcast.net

----- Original Message -----
From: "Vance Nelson" vbnelson@gmail.com
To: "Pascal Gademer" pascal@sandbarhopper.com;
trawlers-and-trawlering@lists.samurai.com
Sent: Wednesday, March 05, 2008 2:54 PM
Subject: Re: T&T: Installing an electric fuel pump for priming and backup

Wesley, thanks for your comments.  My interest in an electric pump was to be
able to have a backup pump to my lift pump on a Ford Lehman 120, and also to
be able to top off my racor 500 after a filter change.  I am familiar with
the bleeding process on the Lehman 120 and have done it a couple of times.

We completed the loop last summer and after 7350 miles and 8-10 filter
changes, I was always able to just top off the racor with a container of
clean fuel, screw on the top and never had to bleed out the system.  It may
be that the Lehman takes so little fuel that the small amout of air in the
very top of the filter canister never gets to the injectors.  I would fill
the canister until it was plump full.

Vance

Subject: Re: T&T: Installing an electric fuel pump for priming and backup