Re: Converting three port fuel pump system to two port pump

[Ian Lomax <sfalfisto@xxxxxxxxx>]

I'm pretty sure mine is plumbed as follows:

fuel goes from tank to pump.
fuel then exits pump to spica pump.
fuel returns to rear of car to a T fitting.  one end
goes to third port of pump, the other end goes back to
tank.

i thought the third port was an outlet that would dump
fuel back into the return line and back to the tank if
the pressure got too high, like from a block.

i could be wrong, but I'll check the plumbing next
time i'm down there.

ian

--- James Montebello <jamesm@domain.elided> wrote:
> At least on my Alfetta, fuel goes from the tank to
> the electric pump,
> from the electric pump to the SPICA pump, from the
> SPICA pump back to the
> 3rd port on the electric pump (then, presumably,
> back to the SPICA pump).
> The return line would have to be plumbed into a tee
> between the tank and
> the electric pump to use a two-port pump.  You can't
> just block off the
> third port, as the return line never goes back to
> the tank.
> 
> jamesm
> 
> On Wed, 26 Mar 2003 AlfaNeely@domain.elided wrote:
> 
> >     The third port on the Alfetta fuel pump was a
> short circuit off the return line.  It sent hot fuel
> back to the engine.  Plugging it off was suggested
> years ago by Joe Benson (former AROC tech advisor)
> so that colder fuel from the tank would reach the
> engine.
> >
> > Ciao,
> > Russ Neely
> > Oklahoma City
> >
> >
> > In a message dated 3/26/2003 2:50:00 PM Eastern
> Standard Time, owner-alfa-digest@domain.elided writes:
> >
> > > Date: Wed, 26 Mar 2003 10:40:32 -0800 (PST)
> > > From: Ian Lomax <sfalfisto@domain.elided>
> > > Subject: Converting three port fuel pump system
> to two port
> > > pump
> > >
> > > I have found a working two-port Bosch fuel pump
> from a
> > > 72 SPICA Alfa, and I want to use it on my 75
> Alfetta
> > > to replace the dead three-port pump.
> > >
> > > The third port on the Alfetta pump is a pressure
> > > release valve.
> > <snip>
> > >
> > > Thanks!
> > > Ian
> > --
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